Independent Epidemiology Consultant


Sampling key populations at higher risk of HIV exposure

The focus of my work is on innovative sampling and population size estimation techniques among hard-to-reach populations, including people who inject drugs, sex workers, men who have sex with men, transgender persons, youth and migrants.

For the past fifteen years, I have worked as an independent consultant providing training on and technical assistance for planning and implementing surveys to measure HIV and other infections (TB, hepatitis, sexually transmitted infections [STI]) prevalence and behaviors and experiences (i.e., HIV testing, health services coverage, sexual and drug use risks, stigma and discrimination, HIV/STI knowledge, etc.) among vulnerable and hard-to-reach populations. I have provided technical assistance to over 40 countries to conduct more than 300 surveys using respondent driven sampling (RDS), Time Location Sampling (TLS) and other sampling methods. I have also utilized numerous population size estimation techniques including capture-recapture, unique object and service multipliers, network scale-up and the Successive Sampling PSE.

See more about the methods I use at Technical Assistance and and Respondent Driven Sampling.

Teaching and training on respondent driven sampling and other research methods

I also provide training and technical assistance for Ministries of Health, Universities and the World Health Organization

on the analysis of data collected using RDS, TLS and other sampling methods. I am the co-founder of Hidden Populations Methods Research Group which has developed user friendly software, RDS Analyst, in R program to analyse RDS data. I am an invited expert to several statistical and methodological review groups.I have been hired by AIDS Alliance, Family Health International/FHI 360, Global Fund to Fight AIDS, Tuberculosis and Malaria, KNCV TB, Ministries of Health, UNAIDS, UNDP, UNFPA, UNICEF, UNESCO, UNODC, StopTB, Universities, WHO, and other organizations and institutions.

See more under Teaching and Training.

Peer-reviewed publications, reports and manuals

I have authored or co-authored numerous journal articles, manuals, reports and books.

See more about my Peer-Reviewed Publications, my respondent driven sampling materials, and my work as a journal reviewer.

Education and University Affiliations

I received an MA from George Washington University, Washington, DC, an MPH from the University of California, Los Angeles and a PhD from Tulane University, School of Public Health and Tropical Medicine, New Orleans, LA. Aside from being an independent consultant, I have affiliations with Tulane University, School of Public Health and Tropical Medicine and University of California, San Francisco, Global Health Sciences.

I am fortunate to have provided assistance worldwide. For more details, please see my CV, Technical Assistance and Teaching and Training.