(AP) — Sumner Redstone, who joined his family’s drive-in movie chain in the 1950s and used it to build a vast media empire that included CBS and Viacom, has died. He was 97.

Under his watch, Viacom became one of the nation’s media titans, home to pay TV channels MTV and Comedy Central and movie studio Paramount Pictures. ViacomCBS Inc., which he led for decades, remembered Redstone for his “unparalleled passion to win, his endless intellectual curiosity and his complete dedication to the company.”

Redstone built the company through aggressive acquisitions, but many headlines with his name focused on severed ties with wives, actors and executives. In multiple interviews, he said he would never die.

His tight-fisted grip on the National Amusements theater chain, which controlled CBS Corp. and Viacom Inc. through voting stock, was passed to his daughter, Shari Redstone, who battled top executives to re-merge the two entities that split in 2006.

The elder Redstone’s battles with his own family were as dramatic as his corporate maneuvers. Son Brent Redstone once sued his father to break up his media empire — then settled for a princely sum to give up his voting shares.

A lanky man with a thick Boston accent, Redstone often told interviewers that “content is king.” And he was right. Despite sagging TV ratings at Viacom, his vast shareholdings in Viacom and CBS led Forbes magazine to estimate his net worth at $4.6 billion.

Born in 1923 in Boston, Redstone graduated first in his class from Boston Latin School in 1940 and completed his education at Harvard in less than three years.