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

For the past eleven years, I have worked as an independent consultant providing training on and technical assistance for planning and implementing surveys, including HIV biological and behavioral surveillance surveys (BBSS), among hidden populations using Respondent Driven Sampling (RDS) and Time Location Sampling and population size estimates using capture-recapture, multiplier, network scale-up and SS-PSE techniques.  

I also provide training and technical assistance on analysis of RDS data using RDSAT and RDS Analyst and am involved in several statistical and methodological review groups. 

I have authored or co-authored numerous journal articles, manuals, reports and books. 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 in the following countries. For a map and more specifications, please see Consultancies & Teaching.

   Albania    Chile    Libya    Seychelles
   Angola    Comoros    Madagascar    South Africa
   Antigua    Croatia    Mauritius    Thailand
   Armenia    Dominican Republic    Montenegro    Trinidad
   Australia    El Salvador    Morocco    Ukraine
   Bangladesh    Estonia    Myanmar    The United States
   Barbados    Ethiopia    Nepal    Venezuela
   Belarus    Guatemala    The Netherlands    Vietnam
   Benin    Honduras    Norway    Zambia
   Bolivia    India    Papua New Guinea    Zanzibar
   Bosnia-Herzegovina    Indonesia    Philippines
   Brazil    Iran    Russia
   Cameroon    Jordan    Serbia