Contact Information
Center for Health Impact Evaluation
Chief Science Office
Los Angeles County Department of Public Health

313 N. Figueroa St., Rm 608
Los Angeles, CA 90012
Phone: (213) 288-8673
Fax: (213) 250-2594
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Who We Are
Will Nicholas, Ph.D., MPH
Director, Center for Health Impact Evaluation

Dr. Nicholas joined the LA County Department of Public Health (DPH) in October 2015. Before joining DPH, he spent five years as a researcher and lecturer at the UCLA Fielding School of Public Health. Prior to that he spent three years as Director of Research at the California Endowment, six years as Senior Research Analyst at First 5 LA, and two years as Associate Policy Analyst at RAND. Dr. Nicholas received a B.A. in Spanish Literature from the University of California, Berkeley; an M.A. in Latin American Studies and an MPH in Population and Family Health from UCLA; and a Ph.D. in Health Policy from Yale University.

Laura Stroud, MSW
Project Manager

Laura is the Project Manager for the Center for Health Impact Evaluation (CHIE). She received her BA in Sociology from the University of California, Santa Barbara and her Masterís degree in Social Work from the University of Michigan with a concentration in Administration and Community Organization. Laura has over 20 years of experience in project, contract and grant management. Before joining DPH, Laura worked for several nonprofits in the field of prevention education.

Semhal Berhe, MPH
Epidemiology Analyst

Semhal earned her Bachelor's and Master's Degrees in Public Health from Cal State Northridge. Before joining CHIE, Semhal was an analyst in the Outbreak Management Branch of the DPH COVID-19 Incident Command System. Prior to that she was a Data Evaluator at Tarzana Treatment Centers and a student professional worker at the LA County Department of Mental Health.

Lisa Greenwell, Ph.D.
Research Analyst III, Behavioral Sciences

Lisa earned a Ph.D. in Sociology from Indiana University and completed a post-doctoral fellowship in Population Studies at RAND. Prior to working on data analyses, public health-related research, and health impact assessments for the County of Los Angeles, she taught and did research at several universities and was a Senior Statistician at UCLA.

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