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HSC Board of Directors

Curtis Riddle


W. Curtis Riddle retired from Gannett’s U.S. Community Publishing Company in 2010 as the senior group president of the East Newspaper Group and president and publisher of The News Journal of Wilmington, Delaware. More

Jack Kasten

Vice Chair

Jack Kasten retired as vice president of Arthur D. Little, Inc., in 1988 after a career in health management. Since then he has been active in the education of health care leaders and in health system reform activities. More

William Clyburn


William Clyburn, Jr., Esq. is the principal of Clyburn Consulting, LLC, a government relations and business development firm that works with public entities, large corporations and small companies. More

Kenneth Silverberg


Kenneth H. Silverberg joined the Washington office of Nixon Peabody LLP in 1990 as a partner following 20 years of practice as a CPA and tax partner with Arthur Andersen & Co.  More

Thomas W. Chapman, MPH, EdD

President and Chief Executive Officer, The HSC Pediatric Center

Thomas W. Chapman, MPH, EdD, has served as president and chief executive officer for The HSC Health Care System since 1998. Tom provides leadership and significant involvement in community service for the nonprofit health care industry. More

Nathaniel Savio Beers, MD, MPA, FAAP

Executive Vice President for Management and Clinical Affairs, The HSC Health Care System

Nathaniel Beers is the Executive Vice President for Management and Clinical Affairs at The HSC Health Care System. He served as the Chief Operating Officer, Chief of Specialized Instruction, and Executive Director for Early Stages in the Office of Special Education in DC Public Schools since 2009. He volunteers as a general and developmental behavioral pediatrician at Children’s National Medical Center, where he was the Medical Director of the Children’s Health Center at CNMC. Prior to joining DC Public Schools, he was the Deputy Director of Policy and Programs for the Community Health Administration of the DC Department of Health and the Title V Director for DC. He has served on the Mayor’s Advisory Committee on Child Welfare and the Children with Special Health Care Needs Advisory Board. More

Elaine Crider

Elaine A. Crider, FACHE, DHSc, MHA, is the founder and president of The Crider Group, which serves government, private and nonprofit organizations and has made positive impacts on organizational development, strategic planning, project management, mergers and acquisitions, and business startups. More

Jennifer Geetter

Jennifer S. Geetter is a partner with McDermott Will & Emery LLP. She focuses her law practice on emerging biotechnology and safety issues and advises hospitals, industry and insurance providers. More

Neil Grammer

Neil Grammer is the senior vice president of internal audit for Interstate Hotels & Resorts, an independent, global hotel management company. More

Diane Lewis

Diane C. Lewis, MPA, is the executive vice president and co-principal of ALTA Consulting Group, Inc., a management consulting firm with extensive experience in health policy and community development, including HUD funded HOPE VI projects. More

Carla Longshore

Carla Longshore was the president of Landmark Services Tourmobile, Inc., and Landmark Services Parking. For almost 23 years, she provided leadership to position the company at the forefront of the tourism/hospitality industry. More

Megan Mariotti

Megan L. Mariotti, RN, CRNP, MPH, is a clinical improvement strategy specialist and pediatric nurse practitioner at Geisinger Health System in Wilkes-Barre, Pa, where she leads efforts to improve the quality and efficiency of care in the pediatric department. More

Sharon Brickhouse Martin

Sharon Brickhouse Martin is a senior health care consultant with expertise in organizational and operational evaluation and improvement. Her skills include business process reengineering, management development and team building, and information systems utilization. More

Roger Meyer

Roger E. Meyer, MD, is the chief executive officer of Best Practice Project Management, Inc., providing project management services to drug companies in the development of drugs to treat psychiatric and neurological disorders. More

Maria Ivonne Rivera

Maria Ivonne Rivera, MPH, has more than 15 years of experience in qualitative research design, development, training and implementation and has worked extensively with the Latino community in the Washington metropolitan area in the areas of outreach, health education and evaluation. More

Michael Ward

Michael D. Ward, CPA, is a director in the professional services firm of BDO USAA, LLP, where he oversees accounting and financial management services for nonprofit organizations and serves as an outsourced chief financial officer to nonprofit organizations. More

Marvin Washington

Marvin Washington is a partner in PricewaterhouseCoopers’s (PwC) Washington Metro Risk Assurance Practice, with more than 27 years of experience leading internal audit engagements, financial statement audits, enterprise risk management engagements, and Sarbanes-Oxley related engagements. More