Marcela Horvitz-Lennon

Natural Scientist
Pittsburgh Office


M.D. in medicine with intern, Pontifical Catholic University; M.P.H. in public health, Johns Hopkins University


Marcela Horvitz-Lennon is a physician scientist at the RAND Corporation. She is also an adjunct faculty member of psychiatry at the University of Pittsburgh Medical School and a member of the medical staff at Western Psychiatric Institute and Clinic. Previously, she was affiliated with the Center for Multicultural Mental Health Research at Cambridge Health Alliance, the Department of Health Care Policy at Harvard Medical School, and with the Chilean Ministry of Health. She has conducted mental health services and policy research on patterns of service use and quality of care for persons with mental illnesses. Horvitz-Lennon's main research interests are health care disparities, diffusion of innovations, underuse of evidence-based practices, overuse of ineffective or low value interventions, care of medical comorbidities, and physician prescribing behavior. She is also interested in methodological issues in psychiatric research. Her main population focus is people with schizophrenia and other severe mental illnesses, including those who are homeless. She has served and continues to serve as principal investigator or co-investigator of NIMH and other federally-funded research. Horvitz-Lennon earned her M.D. in Santiago, Chile, and completed her psychiatric residency training at the University of Maryland Medical School and a fellowship in Community Psychiatry at Johns Hopkins Medical School. She earned a master's degree in public health at Johns Hopkins University School of Public Health.

Recent Projects

  • An In-Depth Investigation of Racial & Ethnic Disparities in Schizophrenia Care
  • Medicare Part D Cost-Sharing & Treatment of Mental Disorders among Disabled Dually Eligible Beneficiaries
  • Evaluation of the SAMHSA Primary and Behavioral Health Care Integration Grant Program
  • Identifying and Addressing Health Care Disparities among Severely Mentally Ill Latinos