Wilson

Wilson was a medical officer who worked for Cerberus and oversaw the Lazarus Project, along with Miranda Lawson. While Miranda ran the project, Dr. Wilson was attached to the bio wing, acting as Chief Medical Officer.

Wilson is voiced by Steve Blum

While the Lazarus Project is rebuilding Shepard, the facility came under attack by rogue mechs and Commander Shepard needed to fight through the facility to escape despite not being fully healed. It is later revealed that Wilson hacked the mechs. Miranda shot him in the throat just before she, Jacob Taylor, and Shepard finally evacuated the station.

The reason for Wilson's betrayal was originally unknown. Various logs written by Wilson indicate frustration with Miranda's standoffish attitude, possibly indicating he snapped due to personal reasons or was attempting to elicit some sort of privileged information from Miranda. While going through information available aboard the Shadow Broker's base however, Shepard uncovers proof in the files regarding Legion that Wilson was in fact working for the Shadow Broker.

Trivia

 * Wilson carries on the tradition, as Corporal Jenkins did, by being a squadmate that is killed early on and replaced by a member with the same abilities (in this case, Miranda). This tradition has been with most Bioware games since Knights of the Old Republic.
 * When you come upon Wilson for the first time he has suffered a gunshot wound to the leg. It is probable that this wound was self-inflicted, to engender trust between himself, Shepard, and Jacob before likely betraying them. All available evidence suggests that the rogue mechs killed every human who could not destroy them or escape from them, so the events almost certainly did not happen as he said -- if the mechs had managed to shoot him in the leg before he could react, the injury would have prevented him from fleeing and they would surely have killed him as well.
 * If you have the Firepower Pack downloaded, then Wilson will have the M-5 Phalanx instead of the M-3 Predator heavy pistol.
 * When Wilson's weapon is holstered his walk animation is the same as Joker's.