University of Massachusetts Medical School

Karen Williams, MSW

Karen Williams directs operations and program development for an array of long-term services and support clinical activities in Massachusetts and New Hampshire. She works with state health and human services agencies that serve complex populations, overseeing a myriad of services including clinical eligibility, Medicaid prior authorization, complex care coordination, and provider network development and administration.

Rachel Gershon, JD, MPH

Rachel Gershon performs legal and policy analysis regarding Medicaid, health reform, and social services. Specific areas of work include health care affordability, Accountable Care Organizations, long-term supports and services, housing supports, language access, and consumer protections. 

Warren J. Ferguson, MD

Dr. Warren Ferguson’s career spans more than three decades and has focused on improving health care outcomes for vulnerable populations who have experienced health disparities. A family physician by training, he has maintained an active practice in two Massachusetts Community Health Centers as a dimension of his academic career.

Katharine London, MS

Katharine London has over 20 years' experience directing complex projects for government agencies, analyzing health care quality and cost data for a variety of health care insurer and provider types, developing payment methodologies, collecting and compiling complex data, and presenting results in consumer-friendly formats. 

Karen Clements, ScD

Dr. Karen Clements is a trained epidemiologist with more than 10 years of experience in health economics and outcomes research. She has expertise in design and analysis of studies that utilize secondary data sources, including administrative databases and health survey data, and experience designing decision analytic models for economic evaluations.

Robert W. Seifert MPA

Robert Seifert joined the Center for Health Law and Economics (CHLE) in 2007. His work at CHLE includes analyzing state and national health care reform, writing about MassHealth – Massachusetts’ Medicaid program – and assisting the Commonwealth in efforts to improve the delivery and financing of services to people with complex health care needs, including those needing long-term services and supports and those who are dually eligible for Medicare and Medicaid.


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