Core Faculty

Andrew Azman

Andrew is a Research Associate in the Department of Epidemiology. His work focuses on understanding the spatio-temporal dynamics of enteric pathogens, like cholera, and strategies to best control outbreaks. In addition, Andrew works on methods for estimating intervention effects, particularly vaccine, with observational study designs. Andrew earned his PhD in epidemiology and MSH in biostatistics from Johns Hopkins Bloomberg School of Public Health. Before coming to Hopkins, Andrew received his B.S. and M.S. in Environmental Engineering from University of Colorado and practiced as an engineer.

M. Kate Grabowski

Mary Kate Grabowski is an Assistant Scientist in the Department of Epidemiology at Johns Hopkins University. She also works as an epidemiologist with the Rakai Health Sciences Program (RHSP) in Rakai District, Uganda. Her primary research interests include the epidemiology and transmission dynamics of sexually transmitted viral infections, local geography and structure of sexual contact networks, and viral phylodynamics. Kate’s research focuses on the transmission, prevention, and control of sexually transmitted viral infections in East Africa. She has spent nearly a decade living/working in African settings where she has been involved in various infectious disease epidemiological and laboratory-based studies. Kate is also currently a member of the Bill and Melinda Gates funded PANGEA-HIV consortium through RHSP. PANGEA-HIV aims to generate 20,000 whole genome HIV sequences to understand HIV transmission dynamics in Africa.

Justin Lessler

Justin Lessler is an Associate Professor in the department of Epidemiology researching the dynamics and control of infectious disease, with particular interest in influenza, measles, cholera and dengue. Justin works on the development and application of statistics, dynamic models and novel study designs to better understand and control infectious disease. In particular, he is interested in creating synergies between infection control practice, data collection and infectious disease dynamics.

Isabel Rodríguez-Barraquer

Isabel is a Research Associate in the ID dynamics group. She is interested in applying novel epidemiological and statistical methods to understand the dynamics of infectious diseases. While she is interested in infectious diseases generally, most of her experience is related to vector-borne diseases such as dengue, malaria, leishmaniasis and chikungunya. Before coming to Hopkins, Isabel completed her medical training in Colombia. She joined the ID dynamics group in 2008 and completed a PhD in epidemiology and an MHS in Biostatistics at the Johns Hopkins Bloomberg School of Public Health in 2012.

Affiliated Faculty

Oliver Laeyendecker

Oliver is a laboratory scientist and infectious disease epidemiologist engaged in studies of HIV, HCV and HSV-2 both domestically and internationally. Primary areas of interest include the development of methods for estimating incidence from cross-sectional surveys, the impact of HIV subtype on disease progression, and the development of serologic and molecular tools to investigate questions related to infectious disease epidemiology. Oliver has worked in infectious disease laboratories since 1990 and holds a PhD in epidemiology, a MS in biotechnology and an MBA all from Johns Hopkins University. He is employed by the NIAID as a Staff Scientist, where he manages the International HIV & STD laboratory of Dr. Thomas C. Quinn. He also has an appointment as an Assistant Professor of Medicine in the Division of Infectious Diseases in the Department of Medicine of Johns Hopkins University and holds a joint appointment as an Assistant Professor in Epidemiology at the Johns Hopkins Bloomberg School of Public Health. He works closely with the Rakai Health Sciences Program and the HIV Preventions Trials Network.

Heather McKay

Heather McKay is a Research Associate  in the Department of Epidemiology at the Johns Hopkins Bloomberg School of Health. Her research experience has focused on the role of circulating biomarkers of inflammation and immune activation in HIV disease progression, including the role of pre-infection and early levels of inflammatory response on subsequent viral setpoint levels and inflammatory dynamics early after infection on long-term non-progression of HIV. Her recent research interests also include the interaction between HIV infection and the dynamics of cholera transmission, the immunogenicity of oral cholera vaccine among HIV-infected populations, and the characterization of global cholera epidemiology.  She has also been involved with classroom instruction of both introductory and advanced epidemiology courses at Johns Hopkins for over 6 years and the revision of the 5th edition of the best-selling introductory textbook, Epidemiology (Dr. Leon Gordis).  Prior to her career at Johns Hopkins, Heather spent 15 years working in the philanthropic/grantmaking sector in New York with responsibilities in program development, management, and evaluation on issues associated with ethnic conflict prevention and resolution, strengthening higher education and research in Africa, international peace and security, and support for independent scholarship. She received her BA degree in Russian History from Columbia University and her PhD in epidemiology from the Johns Hopkins Bloomberg School of Public Health.

William Moss

William Moss is a Professor in the Departments of Epidemiology, International Health and Molecular Microbiology and Immunology at the Johns Hopkins Bloomberg School of Public Health and Head of Epidemiology at the International Vaccine Access Center. He is a pediatrician with subspecialty training in infectious diseases, and has worked in Ethiopia, Kenya, South Africa, Zambia, Zimbabwe and India among other countries. His broad research interests are the epidemiology and control of childhood infections in resource-poor countries. The specific focus of his current research is in understanding the impact of the HIV epidemic on measles control and eradication, the epidemiology and control of malaria in southern Africa, and the care and treatment of HIV-infected children in rural Zambia.

Derek Cummings

Derek is an infectious disease epidemiologist engaged in theoretical and field studies of disease transmission. The goal of his research is to understand the temporal and spatial dynamics of the spread of infectious diseaess in order to inform interventions to control their spread. He is specifically interested in the dynamics of dengue, influenza, measles, and chikungunya. He currently leads field studies of influenza in the US and China, and dengue and chikungunya in Thailand and India. 

David Dowdy

David Dowdy is an Associate Professor of Epidemiology at the Johns Hopkins School of Public Health, with joint appointments in International Health and General Internal Medicine (School of Medicine). His primary research interest lies in merging epidemiological data on implementation, economic evaluation, and mechanistic modeling to understand the dynamics of tuberculosis (TB) - particularly the impact of interventions to improve diagnosis and case finding. He collaborates with field teams in an array of countries including South Africa, Uganda, Zambia, Malawi, India, and Vietnam; he is also a practicing physician in urban East Baltimore and is wrapped around the little finger of his 12-year-old daughter Chesapeake.

Postdoctoral fellows

Lindsay Keegan

Lindsay is a postdoctoral fellow in the department of Epidemiology at the Johns Hopkins Bloomberg School of Public Health. Her research interests include applying mathematical and statistical techniques to basic and applied questions on the ecology and evolution of infectious diseases. Currently she is working on using statistical and mathematical techniques to understand the spread of dengue in Thailand. Lindsay completed her PhD in Biology at McMaster University focusing on modeling the effects of clinical immunity to malaria on disease spread and control and on calculating the reproductive number in a finite population of susceptible hosts. Lindsay has a Bachelors of Science in both Zoology and in Mathematics from the University of Florida (2010).

Sean Moore

Sean is a postdoctoral fellow in the Department of Epidemiology at Johns Hopkins University. His research interests include the ecology and epidemiology of water-borne infectious diseases. His primary research focus is the epidemiology of cholera in Africa. He is currently modeling cholera vaccination strategies and developing statistical modeling techniques to map the spatial and spatiotemporal burden of cholera throughout Africa. He has also studied the dynamics and ecology of other diseases including plague, Ebola, MERS, chikungunya, and Lyme disease. Sean has a PhD in Zoology from Oregon State University and was previously a Climate and Health Posdoctoral Fellow with the National Center for Atmospheric Research (NCAR) and the Centers for Disease Control and Prevention (CDC).

Henrik Salje

Henrik is a postdoctoral fellow in the department of epidemiology at the Johns Hopkins Bloomberg School of Public Health. He is currently working as a visiting researcher in Simon Cauchemez's mathematical modeling unit at the Pasteur Institute in Paris. His interests lie in the spatio-temporal dispersal dynamics of infectious diseases, including the impact of immunity on the distribution of dengue cases in urban and rural settings. Prior to starting his PhD, he worked in the investment banking sector in London, UK, using modeling approaches to advise corporate and governmental organizations on financial and operational matters. He has a Bachelors and Masters degree in Biochemistry from Oxford University, a Masters degree in Biostatistics from Johns Hopkins University and a PhD in Epidemiology, also from Johns Hopkins.

Current Students

Shaun Truelove

Shaun is a PhD candidate in infectious disease epidemiology. His current work includes measles supplemental vaccination modeling and influenza epidemiology. Prior to coming to JHSPH, he worked as an epidemiologist with the CDC’s Global Disease Detection program in Cairo, Egypt, where he worked to establish and develop respiratory disease surveillance programs throughout the Middle East. He has a BS in Biology and an MPH from the University of Wisconsin.

Qifang Bi

Qifang is a research assistant in the infectious disease dynamics group. She received her MHS in Epidemiology from JHSPH in 2014 and B.S.E in biomedical engineering from Duke University in 2012. While at JHSPH, Qifang spent a summer in Bangladesh implementing the WASH Benefits Saliva Study. She is interested in studying spatio-temporal dynamics of disease transmission and the implications on control measures, and her works have focused on Cholera and Dengue. 

Lelia Chaisson

Lelia is a PhD student in infectious disease epidemiology. Her research interests include TB diagnosis, prevention, and control, and the epidemiology of emerging diseases. Prior to JHSPH, Lelia worked as an epidemiologist at UCSF studying the implementation of TB diagnostics in Vietnam and Uganda. Lelia has a BA in Public Health from Johns Hopkins University and an MSc in Epidemiology from the London School of Hygiene and Tropical Medicine. 

Katherine Goodman

Katherine (Katie) is a PhD candidate in infectious disease epidemiology.  Her research interests include strategies for reducing healthcare-acquired infections, Gram-negative antimicrobial resistance in inpatient settings, and the development of evidence-based healthcare epidemiology and antimicrobial stewardship policies. Her doctoral research focuses on piloting rectal screening in ICU patients for a class of highly resistant bacteria, carbapenem-resistant Enterobacteriaceae (CRE), in order to dissect transmissibility heterogeneity within the bacterial class and to develop targeted screening algorithms to identify patients at high risk of asymptomatic CRE carriage.  Prior to JHSPH, she practiced FDA law in Washington, D.C., including work on drug shortages policy development and legislation, Good Manufacturing Practices (GMP) enforcement, and antibiotics in livestock regulations.  She received a post-graduate diploma in public health from the University of Auckland in New Zealand in 2013, received her JD from Columbia Law School in 2010, and holds a BA in philosophy from Dartmouth College.

Marisa Hast

Marisa is a PhD candidate in infectious disease epidemiology. Her current work focuses on malaria and vector dynamics, intervention evaluation, and the contribution of human movement patterns to malaria transmission in southern Africa. Prior to coming to JHSPH, she worked at the CDC's Center for Global Health and Emory University on topics such as cholera, HIV, refugee health, and child protection in the US and abroad. 

Rebecca Pierce

Talia Quandelacy

Talia is a PhD candidate in infectious disease epidemiology. Her interests include understanding seasonal forcing mechanisms of childhood respiratory infections, influenza dynamics and control strategies, and the evolution and animal-host interactions of zoonotic diseases. 

Kathryn Risher

Kathryn (Katie) is a PhD candidate in infectious disease epidemiology, whose research interests include HIV transmission and sexual network dynamics. Her dissertation includes the simulation of sexual networks consistent with survey data in South Africa, and simulating transmission of HIV on these consistent networks to assess network effects on HIV interventions. Her previous work has included a range of HIV-related topics focused in Southern Africa and the United States.


Laura Bowles

Laura is a research assistant in the Department of Epidemiology at the Johns Hopkins Bloomberg School of Public Health.  She received her B.S. in public health sciences from the University of Massachusetts Amherst in 2016.

Joshua Kaminsky

Joshua Kaminsky is a programmer for the Department of Epidemiology at Johns Hopkins University.  His background is in mathematical data analysis, machine learning, and high performance computing.  Now he works on modeling cholera and dengue, and maintains a server for the group.

Friends, Former Students, etc.

Jessica Ladd

Jessica Ladd graduated from JHSPH with a PhD in infectious disease epidemiology. She received an MPH from Johns Hopkins in 2011 and a BA is Public Policy/Human Sexuality from Pomona College in 2008. She is the founder and CEO of Sexual Health Innovations.

Saki Takahashi

Saki received her ScM in infectious disease epidemiology from JHSPH in 2013, and is currently pursuing her PhD at Princeton University. She is interested in the modeling and analysis of infectious disease dynamics and their control measures, and completed her Masters thesis with Dr. Justin Lessler on the spatial distribution of measles immunization uptake in Eastern Africa. Previously, she worked as a research assistant at the Center for Communicable Disease Dynamics at the Harvard School of Public Health, where she studied the temporal dynamics of seasonal influenza strains. Saki received her BA in Applied Mathematics from Harvard College in 2011.

Rachel Lee

Rachel obtained her master degree in the Department of International Health concentrating in Global Disease Epidemiology and Control. She worked as a graduate research assistant with the Infectious Disease Dynamics group to conduct a systematic literature review on the incubation periods for causes of viral gastroenteritis. Rachel used this research to complete her master’s thesis, which evaluated the recommendations made in The Control of Communicable Diseases Manual, a widely used resource in international public health, for clinically differentiating causes of acute gastroenteritis in the field. After receiving her masters, Rachel left Hopkins to pursue an MD at Baylor Medical College. 

Jungen Yi

Jungen was a research assistant in the department of epidemiology at the Johns Hopkins School of Public Health. She managed this website and coordinated activities for the ID Dynamics group. She received her BS in Environmental Geoscience from Boston College in 2011. She left Hopkins to pursue her MPH degree at Columbia University Mailman School of Public Health.

Alison (Su-Hsun) Liu

Alison earned her MPH degree in 2008 and PhD degree in epidemiology in 2012 from the Johns Hopkins School of Public Health. In her doctoral thesis, she has described the temporal variability of HPV DNA and determining how menstrual phases affected the variable detection of HPV in a natural history study by applying event history analysis and time series analysis methods, respectively. After graduation, Alison has shifted her research interests towards the natural history of and host determinants for Staphylococcus aureus colonization in at-risk populations. She is also interested in determining how the intricate interplay between host hormonal status and abdominal adiposity affects the host’s risk for infection or infection outcomes. Alison received her medical degree in 2000 from National Taiwan University.

Carla Zelaya

Carla is an infectious disease epidemiologist focusing on behavioral and social challenges of disease prevention. At Hopkins, her research largely focused on barriers to HIV prevention and care in marginalized populations in Sub-Saharan Africa, Thailand, Vietnam and Russia, and cholera prevention. Carla left Hopkins to pursue a career as an epidemiologist at the CDC.

Ben Althouse

Ben left Hopkins and became Omidyar postdoctoral fellow at the Santa Fe Institute working on mathematical models of the spread of disease in heterogenous environments. He has also developed models of the spread of arboviruses (dengue, yellow fever, chikungunya, zika, rift valley fever) in primate populations in Senegal as well as developed novel methods of predicting incidence of infectious diseases using search query data. He is currently working at the Institute for Disease Modeling in Seattle. He recieved a PhD in epidemiology in 2013 and an ScM in biostatistics in 2010 from the Johns Hopkins School of Public Health. Ben received a BS in mathematics and a BS in biochemistry from the University of Washington in 2008.

Kaitlin Rainwater Lovett

Kaitlin worked with the Infectious Disease Dynamics group to perform systematic reviews, acquire data and implement laboratory testing for projects surrounding immunity to dengue and influenza viruses. As a post-doctoral researcher in infectious disease epidemiology, Kaitlin developed human antigenic cartography to inform epidemiological measures of dengue virus infection and performed a systematic review of influenza interventions in long-term care facilities. Kaitlin left for a position at the Applied Physics Lab.

Hannah Clapham

Hannah joined the ID Dynamics group as a postdoctoral fellow in November 2013. She worked on developing and using mathematical and statistical models to further understand the dynamics of dengue transmission. This included work on the differences between serotypes, the infection to case ratio and the interaction between cross-protection and enhancement. She was interested in how this understanding can be increased by using combinations of multiple data types. Hannah completed a PhD at Imperial College, London, focused on within host modelling of dengue infection. This work aimed to understand the processes driving infection dynamics in both primary and secondary infections. Extensions to this work considered the inclusion of a realistic representation of virus dynamics in models of dengue transmission, with application to assessing the impact of Wolbachia infected mosquitoes. Hannah has a BA in Mathematics from the University of Oxford (2007) and an MSc in Epidemiology from Imperial College (2009). After Hopkins, She joined the Oxford University Clinical Research Unit (OUCRU) in Ho Chi Minh city, Vietnam as a postdoctoral researcher.

C. Jessica Metcalf

Sudarat Chadsuthi

Sudarat's research is about biophysics and stochastic modeling.  She is working on mathematical model of chikungunya, influenza, and leptospirosis. She is also interested the temporal and spatial dynamics to understand and interventions of their spread. She received an MSc degree in Physics from Physics Department, Mahidol University, Bangkok, Thailand, in 2007.

Luis Mier-y-Teran

Luis Mier-y-Teran did his undergraduate studies at UNAM, in Mexico city and then obtained a PhD in Physics at Northwestern University in 2010 working with professors, Mary Silber and Vassily Hatzimanikatis. His thesis research was on the mathematical modeling of protein synthesis from a dynamical systems perspective. His current interests lie in mathematical epidemiology. He worked with the ID Dynamics group on population models of dengue and other diseases.

Ken Cline

Ken is a software developer who worked with the Hopkins Infectious Disease Dynamics Group from 2011 to 2015. He has a background designing and building agent-based models to simulate phenomena such as epidemics, liver tissue, cartel behavior and small-unit military operations. Before coming to Hopkins, he worked for various consulting and internet-software companies. He is interested in the study of complex systems using a spectrum of modeling approaches and the development of tools tointegrate and validate these methodologies. 

Eva Noble

Eva graduated from the University of Pennsylvania in 2010 with BA in Cognitive Science. She worked in the department of epidemiology at the Johns Hopkins School of Public Health on the SMART project with Derek Cummings, managed this site, and coordinated ID Dynamics activities from 2011-2013. She left Hopkins to pursue her MPH at Columbia University.

Byran Dai

Byran worked with the Infectious Disease Dynamics group on the Fluscape project. His research interest was in influenza transmission and healthcare-associated infections (HAI) dynamics. While at JHSPH, Byran served as a PHASE intern at the Maryland Department of Health, where he advised on HAI reporting requirements for the state. Byran graduated from Harvard University in 2011 with a BA in History & Science and a minor in Global Health & Health Policy, and graduated from JHSPH in 2014 with an MS in Epidemiology. He currently resides in New York City and works as a data scientist at Quartet Health.

Nick Reich

Nick is a biostatistician whose research focuses on statistical inference in communicable disease settings. He is currently a Research Assistant Professor in the Division of Biostatistics and Epidemiology at the University of Massachusetts, Amherst. After earning his PhD in Biostatistics at Johns Hopkins, he completed a post-doc in the Hopkins Infectious Disease Dynamics group. He also has a BA in English Literature from Carleton College. Nick's primary research interests are in developing models for complex and dynamic disease systems, developing statistical methods that can draw accurate inferences from disease surveillance data, and optimizing design and analysis strategies for cluster-randomized studies. At UMass, he teaches "Introduction to Statistical Computing and Data Visualization" using R and is the author of several R packages.

Matthew Graham

Matt worked with the infectious disease dynamics group on measles. He holds an MMath in Mathematics from University of Oxford, and a PhD in Complexity Science from University of Warwick.

Steven Riley

Steven is a professor of Infectious Disease Dynamics in Imperial College London. He studies the transmission of human pathogens. He conducts field studies, analyses data and uses mathematical models to look at scientific questions that are relevant to public health: how does our pattern of social contacts affect the transmission of respiratory infections? How much more severe is one strain of influenza than another? How far does influenza penetrate into rural areas after it sweeps through cities?

Emily Gurley

Emily is an infectious disease epidemiologist and the Interim Director for Communicable Diseases at the icddr,b in Dhaka, Bangladesh where she leads studies on the transmission and epidemiology of a variety of emerging and vaccine preventable diseases, including Nipah virus, Japanese encephalitis, hepatitis E virus, cholera, dengue, Chikungunya, and rotavirus. She is interested in improving the communication and collaboration between field epidemiologists and infectious disease modelers, development of novel surveillance strategies, and uses a One Health approach to the study and prevention of infectious disease, taking into account the ecological context in which human disease occurs. Emily is an Adjunct Assistant Professor in the Department of Epidemiology and teaches the Public Health Surveillance course at the Johns Hopkins’ Summer Institute for Epidemiology and Biostatistics. She is a consultant for the Research and Policy on Infectious Disease Dynamics (RAPIDD) program at the Fogarty Center, National Institutes of Health and is a key collaborator for the US Centers for Disease Control and Prevention’s Global Disease Detection site in Bangladesh.

Kerry Shannon

Kerry is an MD/DrPH student in international Health. Her research interests relate to cholera, malaria and humanitarian relief. She is currently working on projects related to cholera in refugee camps and the DRC and a malaria mapping epidemiology project in the Hill Tracts of Bangladesh. Kerry has a B.A. in Chemistry and International Studies from Kenyon College (2004) and an MPH from Johns Hopkins (2007). Before coming to school she received a Fulbright grant to research the implications of large dam projects on communities in northeast Thailand. She later worked at a clinic on the Thai-Burma border with Burmese populations seeking healthcare, where her research related to barriers to access to healthcare and human rights violations among Burmese populations.

Yanjie Huang

Yanjie obtained her master's degree in infectious disease epidemiology. She has a Bachelor of Medicine (2012) and Bachelor of Arts in Economics (2012) from Peking University. 

David Smith

David is interested in the ecology, epidemiology, and economics of infectious diseases. His primary focus is on malaria, though he has also worked on influenza, MRSA, cholera, rabies, dengue, and even some infectious diseases of plants. Basic research questions include the spatial dynamics of pathogen transmission, the measurement of transmission, the evolution of resistance, and the bioeconomics (i.e. the interplay of economic and biological factors) for infectious diseases. He also has an interest in translating knowledge into policy. He is a part of RAPIDD (Research and Policy for Infectious Disease Dynamics), the Malaria Atlas Project, and the Malaria Elimination Group.