In the main Alien continuity he's Michael Bishop, a scientist following in the footsteps of Peter Weyland like many others before him, so human as indicated by the Weyland Yutani Report even passing away from surgical complications later in life.
He's an android in the AVP and AVP Requiem and AVP 2010 continuity though, called Michael Bishop Weyland, successor to Charles Bishop Weyland and the predecessor to Karl Bishop Weyland. All apparently carrying copies of the original conciousness from the original human, that died in Antarctica in 2004, according to Audio Logs in AVP and implied in the ending of the campaign.