Dr. John C. (Jack) Bergstrom 1940 - 2017 A bright light is gone from the Canadian Light Source (CLS) team. Dr. Jack Bergstrom, emeritus professor of physics, passed away on November 29th. Jack was profoundly grateful for the humane care that he received from Drs. Kantham & Haider and the staff at the RUH Oncology Unit. He was especially moved by the opportunity they provided for him to recover some control over his quality of life through the M.A.I.D. (Medical Assistance in Dying) program. Professor Bergstrom felt that he was blessed because he could pursue the love of his life, experimental nuclear physics, and be employed to do so by the University and the CLS. Also this work developed and sustained the opportunity for travel to virtually all parts of the world. Jack Bergstrom was born in 1940 in Vancouver. His family moved to Saskatoon in 1944 where he received his schooling at Wilson, Buena Vista and Nutana Collegiate. As a precocious teenage mad scientist he built a Van de Graaff to produce a high voltage in his parents' basement, one of many such endeavours that he later reflected could have done serious harm to the household. During his experiments, lights in the area would flicker, much to the consternation of the neighbours! In hindsight Jack felt that he should receive no youthful credit for the fact that his parental home, on 8th Street East, still stands. Jack enrolled at U of S where he received his Masters in theoretical physics. In 1962 he married Denise Lafreniere from North Battleford and they moved to Boston. Jack then attended MIT and received his Phd. in experimental nuclear physics in 1969. He returned to the U of S physics department in 1970 where he taught for 30 years. He was a key member of the design team for the CLS. Outside of family, Jack had two main loves - physics and travel, having travelled to over 120 countries. He lived his life as he wanted and accomplished all that he wanted. Professor Bergstrom was pre-deceased by his parents, Dorothy & George Bergstrom, and the mother of his children, Denise Whetstone. Left to cherish memories of Jack are his son Jim and daughter Susan (both of Calgary); his devoted brother Ron (Saskatoon); his nephew Chris (Leah) Bergstrom (Regina); his dearest friend Wendy Duplessis (Peterborough); friend and a mentor to his children Art Whetstone (Saskatoon); special Metinota cousins Dave & Carole Thomson, Eleanor Williams, and Jae Yellowlees; his co-workers at the CLS and many friends. In keeping with Jack's wishes that people remember him as they choose, there will not be a funeral service. Condolences may be sent to Cherished Memories Funeral Services, Martensville, SK.