After his football career, he served as a colonel in the United States Army and as a military attaché in Europe.

[5] He then made the varsity team in 1928 and started at right tackle, helping South Dakota State finish as runner-up in the North Central Conference (NCC) while being named first-team All-NCC.

[11] With South Dakota State, he served as athletic director and basketball coach for SDSU's school of agriculture.

[4][21] In early September, he joined the Indianapolis Indians prior to their game against the NFL's Portsmouth Spartans.

[23] He began the 1934 season with the Gunners but was later purchased in October by the Tulsa Oilers of the American Football League (AFL).

[2] He served in World War II, and according to the Argus-Leader, he "saw action in nearly every theater of war, from the Dieppen raid [sic] to Tunisia where he aided in the defeat of Rummell's Afrika Corps [sic], to England after Dunkirk and to North Africa.

"[27] He later served as a military attaché in Paris, France, and London, England, and retired with the rank of colonel.

[2] Jennison lived in Hopkinsville, Kentucky, for a time, before later moving to Washington, D.C., and then to South Pasadena, Florida.

[2] Jennison died on May 13, 1990, at the age of 80, at the VA Medical Center in Bay Pines, Florida.