image of url County Directory of Information & Services | Public Alerts | Public Information | County Contact Information
Image of LA County logo

Chief Science Office
Center for Health Impact Evaluation
image of los angeles county


Center for Health Impact Evaluation

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) 288-8552
Fax: (213) 250-2594
Image of Adobe Reader Icon

Adobe Reader
Note: PDF documents on this site were created using Adobe Acrobat 5.0 or later. If you are using an earlier version of Adobe Acrobat Reader (4.x or less), document functionality may be reduced.

Please Click Here
Who We Are
Will Nicholas Ph.D. M.P.H.
Director, Health Impact Evaluation Center

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 the Rand. Dr. Nicholas received a B.A. in Spanish Literature from the University of California, Berkeley; an M.A. in Latin American Studies and M.P.H. in Population and Family Health from UCLA; and a Ph.D. in Health Policy from Yale University.

Emily Caesar, MPH, MSW
Project Manager

Emily is the Project Manager for the Center for Health Impact Evaluation. She received her BA in Psychology from the University of California, Berkeley and holds Masterís degrees in Social Work and Public Health from Washington University in St. Louis where her studies focused on youth development and program development, implementation, and evaluation.

Irene Vidyanti, M.Eng, Ph.D.
Data Scientist/Modeler

Irene is a Data Scientist/Modeler. She received her BA/MEng/MA(Cantab) in Information and Computer Engineering at Cambridge University and a PhD in Industrial and Systems Engineering from the University of Southern California. Her role in the Unit is to use data science approaches (such as predictive analytics or forecasting), perform economic evaluation, build or adapt simulation/decision models, and to develop methodological approaches to assist in our analyses, evaluations, and health impact assessments. Her work is crucial in improving operations and developing a more complete understanding of the short- and long-term impact of policies and programs that affect population health. 

Faith Washburn, MPH
Epidemiology Analyst

Faith is an Epidemiology Analyst. She is currently enrolled in an DrPH Implementation Science program at Johns Hopkins, received her MPH in Epidemiology from Georgia State University and her BS in Health Sciences from Armstrong State University. Before working for the Center for Health Impact Evaluation (CHIE), she was an epidemiologist for the CDCís Division of Global Migration and Quarantine (DGMQ) and Division of Global Health Protection (DGHP). Her primary role at CHIE is to analyze and interpret data included in Health Impact Assessments (HIAs) and project evaluations. She ensures that data is translated accurately and communicated meaningfully.

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.

Los Angeles County Seal: Enriching lives through effective and caring services