Charles F. Dolan, the media pioneer and businessman who founded HBO in the early 1970s, merged a group of Long Island cable TV systems into Cablevision, and later created the channel AMC, has died. He was 98.

Charles Dolan, a cable pioneer and patriarch of the Dolan media family, died Dec. 28 of natural causes, Newsday reported. He was 98.

Per CNN, Dolan was also a founder and chairman emeritus of The Lustgarten Foundation, which conducts pancreatic cancer research. According to Forbes, Dolan and his family have a net worth of 5.4 billion at the time of his death.