Management Team

David Spearman, Chief Executive Officer

David Spearman is the President of RadAmerica. He is the chief executive officer for the organization and is responsible for the organization's strategic planning process. David has served the organization in various capacities since 1981. Mr. Spearman may be contacted by telephone at 410-682-6800 or e-mail at [email protected].

Coleman Rosen, Vice President

Coleman Rosen, MS, DABR is the Vice President – Technical Management for MedStar RadAmerica. He previously served as the Chief Physicist for RadAmerica, and a Staff Physicist with MedStar Georgetown University Hospital. Coleman presently works with an accomplished team that comprises Medical Dosimetry, Information Technology, Medical Physics, CyberKnife and SRS Applications, Radiological Engineering, and Radiation Therapist activities. His background also includes serving as Radiation Safety Officer on several State licenses, including Maryland, Virginia, and New Jersey, and as a member of task group 6 for the American Association of Physicists in Medicine [MRI Acceptance Testing], and in various roles for local AAPM Chapters [Treasurer, President]. [email protected] or 410-682-6800.

BobbiBobbi Walston McCoy, Administrative Director

Bobbi Walston McCoy, MPA CMPE is the Administrative Director at RadAmerica.  Bobbi is responsible for all administrative functions as well as facilities. She has over 10 years’ experience in the healthcare management and operations and is certified by MGMA as a Certified Practice Management Executive She has a degree in management from Nyack College and an MPA from Baruch College.  Bobbi may be contacted by telephone 443-777-2334 or email at [email protected].

RobinEnders_125Robin Enders, Risk Management Officer

Robin Enders, BS, RTT, is the Risk Management Officer of RadAmerica. Robin is responsible for developing and directing the risk management and quality assurance program of RadAmerica. Robin coordinates the accreditation process with The Joint Commission, American College of Radiology, and the Accreditation Association for Ambulatory Health Care. She is responsible for other risk management activities such as resolving patient grievances, occurrence reporting management, annual mandatory associate education, and corporate risk management. Robin may be contacted by telephone at 443-777-2331 or e-mail at [email protected].

James-Rodgers-125x150James Rodgers, Director, CyberKnife Physics

James E Rodgers, Ph.D. is the director of the CyberKnife Stereotactic Radiosurgery program. His responsibilities include CyberKnife SRS/SBRT treatment planning, CyberKnife physics and QA, and RadAmerica radiation shielding design. He is board certified in radiation physics and has distinguished achievements in the field of medical radiation physics. James may be contacted at [email protected].

Mike-KaritaMike Karita, Director of Information Services

Mike Karita, MCSE, MCP, A+ is the Director of Information Services. In this role, he is responsible for the technology and information systems serving patients, physicians and staff. Mike holds a bachelor’s degree in Applied Information Technology from the University of Baltimore. Mike may be contacted by telephone at 443-777-2324 or email at [email protected].

Marjorie Seidel, Chief Dosimetry

Marjorie Seidel CMD is the Chief of Dosimetry at RadAmerica and is well versed in all aspects of treatment planning. She leads a team of skilled and compassionate medical dosimetrists providing high quality dosimetry with a focus on patient safety and planning excellence. Marjorie may be contacted at 443-777-2347 or at [email protected].

Christopher Osik, Technical Director

Christopher Osik, B.A. R.T. (R)(T) is the Technical Director of RadAmerica. He oversees the radiation therapy team at our seven offices. Chris has over 30 years experience in healthcare as a Radiation Therapist and Radiologic Technologist. He has over 16 years in management with an emphasis in project management. Chris believes is building strong and flexible teams and has always maintained an open door policy. He may be contacted by telephone at 443-777-2337, or e-mail at [email protected].

Rebecca Gerlach, Administrative Officer

Rebecca Gerlach, RN, is the Administrative Officer at RadAmerica. Becky is responsible for office management over our seven offices, including billing, coding and revenue cycle. Becky maintains an open-door policy and may be contacted by telephone at 443-777-2320 or by email at [email protected].



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