 He was awarded a CBE and the first United Nations/UNESCO Hellmut Mehnert Award for the Prevention of Diabetes and its Complications in 1998.He received the American Diabetes Association's Kelly M. West Award for Outstanding Achievement in Epidemiology and Harold Rifkin Award for Distinguished International Service in the Cause of Diabetes in 1989 and 1992 respectively.Keen married Anna "Nan" Miliband, the sister of sociologist Ralph Miliband, in 1953; they had a son and a daughter.