Isaias Sandoval

Doctor Isaias Sandoval is a respected doctor and high-ranking member of Humanity Front. He is a personal aide and close friend to Bill Taggart.

Deus Ex: Human Revolution
Isaias Sandoval is first encountered after Jensen returns from the Highland Park FEMA facility, where he, along with Bill Taggart, is at Sarif Industries. There Jensen can inquire about him, where he reveals he has a particular hatred for augmentations, having spent much of his career helping out victims of implant rejection and Neuropozyne addiction, and witnessed the dangerous side effects firsthand.

He reveals he had a brother who was an augmented veteran. This brother suffered rejection psychosis as an effect of his military-given implant, and attempted to commit suicide-by-cop by going on a rampage at a shopping mall. However, he was successfully talked down with no deaths by Bill Taggart, who treated him. Because of this incident, Sandoval feels he has a personal debt to Taggart.

Later, Jensen finds out from Eliza Cassan that Sandoval was personally involved in the attack on Sarif Industries, having assisted the Tyrants by surgically removing the Sarif scientists' GPL implants so they could be kidnapped. Jensen obtains Sandoval's location from Taggart - a rundown apartment in Detroit near Derelict Row. However, when he reaches the apartment, he finds it is actually the entrance to a secret underground bunker and hiding place of Sandoval, filled with Purity First members, an organization Sandoval had secretly been assisting behind Taggart's back all along, knowing his disdain for violence.

Jensen finally confronts Sandoval in his private office, where he loads up a revolver with a single round and prepares to commit suicide. Knowing his secret is out and his career is over and that Taggart now will work to distance himself from him, Sandoval fears he has no future but in prison and thinks of himself as a mass murderer for his complicity in the Tyrants' activities, and is prepared to take his own life. However, Jensen can talk him down with some persuasion, and Sandoval will agree to being arrested peacefully.

If kept alive, he will give Jensen some information regarding the Tyrants and their attack on Sarif Industries, particularly that the scientists, including Megan, were taken alive.