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Among the stars who mourned legendary director and producer Garry Marshall after his death on Tuesday were Happy Days actors Henry Winkler and Ron Howard.

Marshall created Happy Days, which ran from 1974 to 1984, and turned Winkler and Howard into household names as Arthur Fonzarelli and Richie Cunningham, respectively.

“Rest In Peace,” Winkler wrote on Twitter. “Thank you for my professional life. Thank you for your loyalty , friendship and generosity.”

In a later tweet, he added, “Larger than life, funnier than most , wise and the definition of friend.”

After posting several stories about Marshall, Howard wrote how the producer and director’s “humor and humanity inspired.”

“He was a world class boss and mentor whose creativity and leadership meant a ton to me,” he added in subsequent tweets. “I miss Garry already. He leaves a huge void for all who were lucky to be in his orbit. A great friend.”

Read their tweets below. Marshall died from complications of pneumonia following a stroke. He was 81.