[4] Mann started teaching at Eastern Nazarene as a math professor in 1929 and became the assistant to the president, Gideon B. Williamson, in 1941.
[1] He also served as dean of men and business manager before he became vice-president of the college in 1945, and was elected president in 1948, a position he held until 1970.
Speaking at a North Quincy High School commencement in 1958, Mann is quoted as having said: "The attitude one takes toward work is an indication of the kind of person he is.
He was named President Emeritus of Eastern Nazarene College in 1983, upon returning to Quincy.
Mann had four sons, Edward, Merritt, Robert, and Richard, and three stepchildren, Gary, Gordon, and Katherine Angell.