William J. Walker, Jr., Ph.D.
Physics and Treatment Planning
WILLIAM J. WALKER, JR., Ph.D. is currently the President and CEO of Comprehensive Physics and Regulatory Services, Ltd. overseeing a staff of 18
professional medical physicists, dosimetrists and service personnel, and is responsible for corporate programs to provide quality medical radiation therapy
physics and state-of-the-art treatment planning services to over 20 free-standing radiation therapy centers located in eastern United States, treating around 450 cancer patients daily.
He was the Director of Physics for EquiMed, Inc. administering the Radiological Physics, Regulatory Affairs, Radiation Safety and National Service programs from 1994 to 1998; and the Chief of Radiation
Safety Branch, Division of Safety and Radiation Safety Officer of the National Institutes of Health in Bethesda, MD from 1989 to 1994. He served as a consultant to the U.S. Nuclear Regulatory Commission
in Washington, D.C., a senior consultant to the Institute for Radiological Imaging Sciences in Germantown, MD, and Consulting Radiological Physicist to Sacred Heart Hospital in Allentown, PA.
During the year of 1988, he functioned as the President of Radiopharmaceutical Management Services in Rockville, MD; from 1985 to 1988 served as Senior Vice-President and Chief Scientist at Health Physics
Services in Rockville, MD; and was the Vice-President of the Medical Division of RSO, Inc. in Laurel, MD from 1983 to 1984. His career was furthered by being the Section Leader, Medical and Academic
Licensing Section of the U.S. Nuclear Regulatory Commission from 1978 to 1983; Chief of Medical Physics at Malcolm Grow U.S. Air Force Medical Center at Andrew Air Force Base from 1971 to 1978; President of
Physics Control, Inc. in Waldorf, MD from 1973 to 1978; Research Health Physicist at the Air Force Weapons Laboratory at Kirtland Air Force Base in Albuquerque, NM from 1964 to 1968; Command
Environmental Engineer at Headquarters, 7th Air Division in High Wycombe, England from 1960 to 1962; and Base Sanitary and Industrial Hygiene Engineer at Castle Air Force Base in Atwater, CA from 1958 to 1960.
Professionally, he served as the Secretary/Treasurer, then President of the Mid-Atlantic Chapter of the American Association of Physicists in Medicine; on the Certification Exam Panel of the American Board of
Health Physics; is a Member of the Visiting Committee for the Department of Nuclear and Radiological Engineering at the University of Florida; and has served on several Committees of the American College of
Nuclear Physicians, including the Nuclear Medicine Science Committee, the Standardization of Nuclear Medicine Instrumentation Committee, Government Affairs Committee, Equipment Specifications and
Performance Committee, and Subcommittee on Nuclear Medicine Technology.
He is a member of the Health Physics Society, American Association of Physicists in Medicine, Society of
Sigma XI, Lions Club International, and was Chairman of the Board of Directors of the Profound Paralysis Foundation.
Doctor Walker received his Ph.D. in Radiological Physics in 1971 from the University of Florida, his Master of Science in Radiation Biophysics from the University of Kansas in 1964, and a Bachelor of Science in
Civil Engineering from the Virginia Military Institute in 1958. He is a Certified Health Physicist from the American Board of Health Physics, a Registered Professional Civil and Sanitary Engineer, a Licensed
Therapeutic Radiological Physicist in the State of Florida, a Qualified Expert for Diagnostic and Therapeutical X-ray Inspection in the State of Virginia, and a Qualified Expert as a Radiation Machine
Inspector in the State of Maryland. To his credit, he has authored and coauthored 18 publications.