With Larry Niven he has collaborated on a string of bestselling novels, including Lucifer's Hammer, The Mote in God's Eye, Footfall, and many more. He holds advanced degrees in psychology, statistics, engineering, and political science, and has been involved professionally in all these fields. He and his wife live in Los Angeles.

    The supplement expands the Necromunda game by introducing four new gangs (Ratskin Renegades, Redemptionists, Scavvies and Spyrers).Also included are new scenarios and a bestiary of under-hive nasties.