Marsha Regenstein is a health policy researcher with over 30 years of experience studying the relationship between low-income and underserved individuals and the US health care system. Most of her work has focused on access, quality and cost of health care for patients who use safety net organizations such as community health centers and public hospitals. She has served as PI or co-PI on more than 50 government- and foundation-funded projects, using a combination of qualitative or mixed-methods approaches. She has worked for years in senior roles on projects that cross multiple settings and populations. Among these are several large programs funded by the Robert Wood Johnson Foundation (Aligning Forces for Quality, Speaking Together, Expecting Success, Urgent Matters) aimed at improving the quality of the nation's health system at the community and provider levels. She has led teams of researchers who conducted hundreds of site visits and focus groups and developed customized tools, reports and publications for use by many different audiences. She currently serves as PI on a HRSA-funded cost evaluation of the Teaching Health Center Graduate Medical Education program, a Cystic Fibrosis Foundation-funded survey of cost burdens associated with accessing health care for persons with cystic fibrosis, a Missouri Foundation for Health-funded evaluation of the public health response to COVID-19 in Missouri, and a HRSA-funded mixed methods study of the ways that community health centers address the language needs of their patients. For ten years, she led the Milken Institute School of Public Health's Doctor of Public Health (DrPH) program.