He served in the Army during World War II, then worked with Toby Browne, Al Sears, Sid Catlett, and Tiny Grimes in addition to leading his own trio in the early and middle 1940s; he also appeared in the film Jammin' the Blues in 1944.
From a review by radio disc-jockey Jim Bartlett of station Magic 98: “Play the Thing”/Marlowe Morris Quintet (3/31/62, one week).
Morris was a distant relative of jazz pianist Fats Waller.
He played piano and organ (supposedly having learned from Waller) and recorded with jazz giants Coleman Hawkins, Lester Young, and Ben Webster, among others.
His most famous credit might be the 1944 short film Jammin’ the Blues, which is beautifully shot and features some exquisitely tasty playing.