Grappell and Walker Radiology is part of the Medical Arts Radiology center located in West Islip. Led by Paul Grappell, M.D. and James T. Walker, M.D. The office specializes in radiology testing and diagnostics, including x-rays, biopsies, ultrasounds, mammography, computed tomography and nuclear imaging. Walker is a board-certified radiologist who has been in private practice on Long Island since 1983. Grappell is the founder of Grappell and Walker Radiology, which has been in West Islip since 1982. He has been practicing medicine for more than 30 years.