His most famous works include a noted run on the Iron Man series in the early 1980s which introduced the character's serious problem with alcoholism, his specialized power armor variants and his new enmities with Justin Hammer and Victor Von Doom. His most noted cliffhanger was when Tony Stark was thrown out of S.H.I.E.L.D's helicarrier and had to don his power armor completely to use its flight function before he hit the ground.
In the late 1980s, he also wrote a popular run on The Amazing Spider-Man series which featured the art of Todd McFarlane and introduced the popular supervillain, Venom.