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Roderick N. Seamster, MD, MPH

President & CEO

On September 16, 2016, Dr. Roderick Seamster was appointed President and Chief Executive Officer of the Watts Healthcare Corporation (WHCC), a private, non-profit, community based organization in South Los Angeles where he directs a staff of over 300 and manages an operating budget of approximately $36 million.

Prior to this appointment, he held several positions within WHCC that included Chief Medical Officer from 2007 to 2016, Internal Medicine Department Chief, Internal Medicine Staff Physician, Director of the UHP Compton Healthcare Clinic and Associate Medical Director.  In 1990, Dr. Seamster joined the U.S. Public Health Service Commissioned Corps as a National Health Service Corps Scholar and was stationed in San Carlos, Arizona, home of the San Carlos Apache Indians. Upon his honorable discharge in 1992, he achieved the rank of Lieutenant Commander.

Dr. Seamster is a current member of the Community Clinic Association of Los Angeles County where he sits on the Clinical Advisory Committee; the Community Health Council and the Disparities in Healthcare Advisory Committee.   A graduate of both Harvard Medical School and Harvard School of Public Health Dr. Seamster received his Doctor of Medicine and Master of Public Health degrees respectively and he completed his Internal Medicine residency at the University of California at Irvine.


Olusheyi Lawoyin MPH, MBA

Chief Operations Officer

Olusheyi (Sheyi) Lawoyin is the Chief Operations Officer at Watts Healthcare Corporation, where she is responsible for the day to day operating activities and provides executive leadership for advancing the Watts Healthcare Corporation.

Prior to her appointment, she led Patient-Centered Medical Home and Lean care transformation at Clinica Sierra Vista, a network of integrated community health centers, serving the primary medical, dental and behavioral health needs of about 200,000 individuals in Kern, Fresno, and Inyo counties. Prior to this, she was the Director of Operations at a Community Health Center in Northern California and worked in operations and planning with Emory Healthcare and Emory University School of Medicine in Atlanta, Georgia.

With a background in global and community health, she has been a United States Peace Corps volunteer with the Namibian Ministry of Health and Social Services; managed the health portfolio for the Public Affairs Section of the US Consulate General in Lagos, Nigeria; provided program and research support at the Institute of Medicine of the National Academies, and served as an ASPH/CDC Global Health Fellow with the Centers for Disease Control and Prevention.

Sheyi received an MBA from Emory University’s Goizueta Business School and an MPH from George Washington University’s School of Public Health and Health Services.


Haregewoin (Hara) Yohannes, B.S.B.M., M.B.A.

Interim Chief Financial Officer

Haregewoin (Hara) Yohannes has served as the Vice President of Finance at Watts Healthcare Corporation since April 2003 and was appointed Interim Chief Financial Officer on September 26, 2019.  She previously served as Financial Analyst, Manager of Operational Analysis, Director of Finance & Analysis, Controller and Acting CFO.  She has worked at Charles Drew University of Medicine and internationally on the continents of Africa and Asia.

Ms. Yohannes earned a Bachelor of Science degree in Business Management from Pepperdine University Malibu and a Master of Business Administration with an emphasis in Finance from California State University, Long Beach, California


Dr. Oliver Brooks, MD

Chief Medical Officer

Dr. Oliver Brooks has been with Watts Healthcare since 1989.  He was appointed Medical Director on October 16, 2016, and previously served as Associate Medical Director, Chief of Pediatrics and Adolescent Medicine and is the Medical Director for the Jordan and Locke School-based Wellness Centers.  He is also chairman of the quality management committee.

Appointments have included serving on the Executive Committee of Centinela Hospital where he was Chairman of their Peer Review Committee and on the Physician Quality Committee for LA Care Health Plan.  Dr. Brooks is past president of the Golden State (CA) Medical Association and past president of the Miller-Lawrence Medical and Dental Society. In 2019, he was elected to the office of the President of the National Medical Association.

Dr. Brooks holds a degree in chemistry from Morehouse College and a medical degree from Howard University.


Dana Knoll, BSBA, MBA

Vice President, Programs

Dana Knoll, is currently the Vice President of Programs at the Watts Healthcare Corporation after having previously served as Vice President of Administrative Operations from 2014 to 2019. After completing a Fellowship at Johns Hopkins University School of Public Health, Ms. Knoll worked as Clinic Manager for Drew Health Foundation in northern California, as a Manager at UHP Healthcare in southern California, a Project Director at Children’s Hospital of Orange County and a Project Director at the Community Clinic Association of Los Angeles County. She joined Watts Healthcare in 2007.

Ms. Knoll received both her Bachelor of Science degree in Business Administration and her Master of Business Administration from the University of Redlands.

Watts Healthcare now provides COVID-19 drive-up testing by appointment only. Please call to schedule your appointment at 323-564-4331. Monday – Friday from

8:30 am – 4:30 pm.

Watts Healthcare esta haciendo la PRUEBA COVID-19 por auto-servicio con citas solamente. Por favor llame para programar una cita a 323-564-4331. Lunes – Viernes

8:30 am – 4:30 pm.

If you have Kaiser Health Plan, please contact Kaiser for testing options as Watts Healthcare is not authorized to test Kaiser patients.

Si tiene un Plan de salud de Kaiser, comuniquese con Kaiser para conocer las opciones de prueba, ya que Watts Healthcare no esta autorizado para evaluar a los pacientes de Kaiser.

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