Manny Stallman began his career in the early 1940s doing production work for MLJ. He eventually started penciling, doing among others 'Young Robin Hood' for Lev Gleason in 1943. He teamed up with John Giunta, with whom he did a lot of horror, war and romance work for Harvey. Throughout the 1940s, he drew for several of Lev Gleason's crime comics, among others on the original 'Daredevil', as well as in other books by Prize Comics and Holyoke. He also occasionally assisted Will Eisner on 'The Spirit'.
In the 1950s, Stallman (and Giunta) drew crime and horror stories for Atlas, Avon and Harvey, and drew 'Big Town' for DC, along with contributions to 'Strange Adventures', 'All-American Men of War', 'Mystery In Space', 'Our Army At War', 'Phantom Stranger' and the romance titles. In the 1960s, he joined Harry Shorten at Tower Comics, where he worked on 'The Raven' for 'T.H.U.N.D.E.R. Agents'. In the final stages of his career, Stallman worked for an ad agency, where he did advertising comics with 'Basky & Robin' and 'Big Boy'.