Mr. Teague

Mr. Teague was played by James Karen in Poltergeist.

Biography
He is the boss of Steve Freeling. He was the one, who built a living place called Cuesta Verde in California, while Steve Freeling, as his underling, sold the greatest part of it.

He commits the unethical decision only to remove the gravestones and not to remove the dead from a burial place, where he later built the homes in Cuesta Verde. It unleashed the events in the Poltergeist franchise, the disintegration of the Freeling´s home and the partial destruction of Cuesta Verde. It also led later to the abandonment of the entire area because of it.

It is implied, he will face a dark future for what he did.