Peter Allen (December 13, 1921 – November 17, 2014) was a Canadian surgeon who played a leading role in improving cardiac surgery techniques.
Along with Dr.
Philip Ashmore, Dr.
W.G.
(Bill) Trapp and Dr.
Ross Robertson, he performed the first Open Heart Surgery in British Columbia on 29 October 1957 at Vancouver General Hospital, by closing an Atrial Septal Defect (ASD) in 9 year old John Evans, using Cardiopulmonary Bypass (CPB).