 It was also during this time, in 1935, that Linfoot would marry fellow mathematician Joyce Dancer, with whom he would have three children, Roger in 1941, Margaret in 1945 and Sebastian in 1947.During World War II Linfoot put his skills to use for the Ministry of Aircraft Production, producing optical systems for air reconnaissance.Following the war, Linfoot was awarded an ScD by the University of Oxford for his work in mathematics.