Peter Sanderson is a comic book critic and historian best known for his work on detailing the backgrounds and histories of comic book characters for various publishers. He has worked extensively with Marvel Comics, where he has contributed to the writing of "The Official Handbook of the Marvel Universe," and has crafted a number of its updates and editions. Sanderson is known for his encyclopedic knowledge of comic book lore and has written and contributed to other works that delve into the rich narratives and character developments within the comic book industry. It's worth noting that there may be multiple individuals named Peter Sanderson, but this description focuses on the one known for his contributions to the comic book world.