Sid Caesar, a comic actor who came to prominence with the 1950s variety program Your Show of Shows, has passed away.

Former CNN host Larry King tweeted the news Wednesday, calling the 91-year-old Caesar “a dear friend” and a “comic genius.”

Sorry to learn about the passing of Sid Caesar-a dear friend, a comic genius & an American classic- there will never be another one like him — Larry King (@kingsthings) February 12, 2014

Over his nearly 60-year career, Caesar was a familiar face on television and Broadway and in movies. In addition to performing comedy on Your Show of Shows and the subsequent Caesar’s Hour, the actor also made appearances on The Love Boat; Love, American Style; That Girl and The Carol Burnett Show.

He also played Coach Calhoun in the big-screen adaptation of Grease and its sequel, Grease 2.

In 2006, Billy Crystal presented Caesar with the Pioneer Award at the 4th Annual TV Land Awards.