Jasper Sitwell appears as an agent of the fictional espionage agency S.H.I.E.L.D., beginning in the feature "Nick Fury, Agent of S.H.I.E.L.D." in Marvel Comics' Strange Tales #144 (cover-dated May 1966) and continuing into the subsequent Nick Fury, Agent of S.H.I.E.L.D. comic-book series in 1968. He became the S.H.I.E.L.D. liaison to defense industry contractor Tony Stark (Iron Man) beginning in the "Iron Man" feature in Tales of Suspense #93 (Sept. 1967), and continuing into that subsequent series as well. He was seldom featured from the early 1970s until the 1988 miniseriesNick Fury vs. S.H.I.E.L.D., and then again in the 1996-1997 series Iron Man vol. 2. Sitwell afterward appeared in a three-issue arc of the superhero-team series The Avengers in 2000, and in Punisher War Journal #1 (Jan. 2007).