In Comics
Superman Vol 2 #1
(January, 1987)
The X-Men #49 - Who Dares Defy The Demi-Men?
Base
Mobile, though he generally operates out of Metropolis
Serval Industries, Virginia; formerly X-Factor Investigations Headquarters, Starjammer; Xavier Institute for Higher Learning, Salem Center, Westchester County, New York; Genosha; X-Factor HQ, Washington D.C., Maryland; Mutant Research Center, Muir Island;