NEW YORK (AP) – The co-creator of the beloved children’s education TV series “Sesame Street,” Lloyd Morrisett has died. He was 93.

Morrisett’s death was announced Tuesday by Sesame Workshop, the nonprofit he helped establish under the name the Children’s Television Workshop. No cause of death was given.

Sesame Workshop in a statement hailed Morrisett as a “wise, thoughtful, and above all kind leader.” Morrisett and Joan Ganz Cooney worked with Harvard University developmental psychologist Gerald Lesser to build the show’s unique approach to teaching that now reaches 120 million children.

Legendary puppeteer Jim Henson supplied the critters.