A brilliant geologist and expert on mining techniques, searching out planets to mine for the Planetary Resources Commission. He was also, in Kerr Avon's words, "greedy, avaricious, and a crook", delaying revelation of his findings whilst he manipulated the commodities market. Gerren and two associates tried to lift Belkov's cache of ppfeldon crystal[[s from Orbiter, and only Gerren survived, even he being wounded. He had been in league with Avon for some time before the rest of the crew even heard of him. He joined Del Tarrant, Dayna Mellanby and Vila Restal on Mecron II, but was shot trying to escape back to Scorpio and was last seen as Servalan's prisoner.