Professor Pepperwinkle
aka Professor Jasper J. Pepperwinkle
A "well-known" inventor and apparent acquantaince of Clark Kent who resides in a "modest suburban home" near Metropolis. In March 1976, he provides the intrepid reporter with an anti-gravity "gizmo" that Clark Kent, who is temporarily without his super-powers as the result of a complex scheme instigated by the alien observer Mr. Xavier, uses to defeat a group of Inter-Gang hoodlums (S No. 297: "Clark Kent Forever--Superman Never!").
Professor Potter considers himself to be the "greatest inventor in the world," while Clark Kent notes that he has "been known to fowl-up occasionally" (S No. 297, Mar 1976: "Clark Kent Forever--Superman Never!").
(This entry still needs biographic info from Act No 442/1, Dec 1974: "The Midnight Murder Show!"; S No. 289/1, Jul 1975: "The Phantom Horseman of Metropolis!"; S No. 308, Feb 1987: "This Planet is Mine!")