J.K. Rowling’s “Harry Potter” novels and Suzanne Collins’ “The Hunger Games” series along with a wide range of educational materials, reading clubs and book fairs, has died. He was 84.

The children’s publishing giant announced that Robinson died Saturday, but did not immediately provide a cause. The publisher said he had been in excellent health.

“We are deeply saddened by the sudden passing of Dick Robinson,” Scholastic’s board of directors said in a statement. “Dick was a true visionary in the world of children’s books and an unrelenting advocate for children’s literacy and education with a remarkable passion his entire life.”

Rowling remembered Robinson on Monday as a “wise, kind and humane man,” who was “an early champion of Harry Potter and a stalwart support to me through the twenty-four years we knew each other.”

Brian Selznick praised the “the power of his leadership and the clarity of his mission,” and Ruby Bridges, who as an author drew upon her experiences as the first Black child to attend an all-white New Orleans elementary school, called Robinson a “friend and mentor.”

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A Pittsburgh native and graduate of Harvard College, Robinson was the son of Maurice R. Robinson, who founded Scholastic as a classroom magazine in 1920. The younger Robinson worked as a teacher and bricklayer, among other jobs, before joining Scholastic in the mid-1960s. He was named president in 1974, CEO in 1975 and board chair in 1982.