I am an Assistant Professor of Biostatistics and Epidemiology at the University of
California, Berkeley. I received an M.D. from the University of California, San Francisco
and a Ph.D. in Biostatistics from Berkeley. 

My research interests include the treatment of HIV resistant to antiretroviral drugs, the
use of antiretroviral therapy in resource limited settings, and combined approaches for
prevention and treatment of HIV infection. Methodologically, I am interested in the
application of causal inference methods to observational clinical datasets, the
development of methods to estimate the effects of individualized treatment strategies
(dynamic treatment regimes), and the evaluation of community-based interventions. I have
a strong interest in the interface between biostatistics, epidemiology, and clinical
medicine, including the communication of new statistical methods to non-statistical
audiences, and the application of advances in biological and clinical understanding of
disease to drive the development of new statistical methodologies. 

Together with Judea Pearl, Jasjeet Sekhon, and Mark van der Laan, I am pleased to
announce the launch of the Journal of Causal Inference - a new journal that publishes
papers on theoretical and applied causal research across the range of academic
disciplines that use quantitative tools to study causality. Our first issue is planned
for 2013. http://www.degruyter.com/view/j/jci

Articles

Compound treatments, transportability, and the structural causal model: the power and simplicity of causal graphs., Epidemiology (2011)
 
A Marginal Structural Model to Estimate the Causal Effect of Antidepressant Medication Treatment on Viral Suppression Among Homeless and Marginally Housed Persons With HIV (with Alexander Tsai, Sheri Weiser, Kathleen Ragland, Margot Kuschel, and David Bangsberg), Archives of General Psychiatry (2010)
 
Diagnosing and responding to violations in the positivity assumption (with Kristin Porter, Susan Gruber, Yue Wang, and Mark J. van der Laan), Statistical Methods in Medical Research (2010)
 
Retention in Care among HIV-Infected Patients in Resource-Limited Settings: Emerging Insights and New Directions (with Elvin Geng, Denis Nash, Andrew Kambugu, Yao Zhang, Paula Braitstein, Katerina Christopoulos, Winnie Muyindike, Mwebesa Bwana, Constantin Yiannoutsos, and Jeff Martin), CURRENT HIV/AIDS REPORTS (2010)
 
Biomarker discovery using targeted maximum-likelihood estimation: Application to the treatment of antiretroviral-resistant HIV infection (with Oliver Bembom, Soo-Yon Rhee, W Jeffrey Fessel, Sandra E. Sinisi, Robert W. Shafer, and Mark J. van der Laan), Statstics in Medicine (2008)
 

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Contributions to Books

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Identifying important explanatory variables for time-varying outcomes. (with Oliver Bembom and Mark J. van der Laan), Fundamentals of Data Mining in Genomics and Proteomics (2006)
 
The healthcare system and HIV epidemic in Brazil. (with Claudia Travassos, Francisco I. Bastos, Mariana Hacker, Eduard J. Beck, and Jose Carvalho de Noronha), The HIV Pandemic: local and global implications. (2005)
 
Management of HIV/AIDS: The Brazilian experience. (with Francisco I. Bastos, Diane Kerrigan, and Marie-Claude Bioly), Antiretroviral treatment: Experiences and challenges. [In French] (2004)
 

Selected Technical Reports

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Diagnosing Bias in the Inverse Probability of Treatment Weighted Estimator Resulting from Violation of Experimental Treatment Assignment (with Yue Wang, David Bangsberg, and Mark J. van der Laan), U.C. Berkeley Division of Biostatistics Working Paper Series (2006)
 
Estimation of Direct and Indirect Causal Effects in Longitudinal Studies (with Mark J. van der Laan), U.C. Berkeley Division of Biostatistics Working Paper Series (2004)