Vreen, a male Human physician, was initially employed by Bioniip Laboratories. Later, during the First Galactic Civil War, he was recruited by Doctor Issan Len to contribute to the development of the droid prototype, designated X0-X1. Around 1 ABY, Vreen tried to broker a deal involving the sale of this droid to Lira Wessex, who represented the interests of the Galactic Empire.