“…We regret to inform readers of Medical Physics that a pioneer in our discipline, James G. “Jim” Kereiakes, died June 26, 2017 at the age of 92. Jim was a highly accomplished and productive physicist who contributed in multiple ways to progress in medical physics and its impact on radiology, nuclear medicine, and radiation oncology . He was revered by his students and colleagues, and his influence on these individuals was profound.…”