Entertainment TV 'Sesame Street' Co-Creator Lloyd N. Morrisett Dead at 93: 'A Wise, Thoughtful, and Above All, Kind Leader' Lloyd N. Morrisett and Joan Ganz Cooney created the renowned children series in 1969 By Ingrid Vasquez Ingrid Vasquez Twitter Ingrid Vasquez is a Digital News Writer at PEOPLE. She graduated from The University of Texas at Austin with a Bachelor in Journalism. Before joining the team, she worked as an Editor at FanSided and provided work in the celebrity and lifestyle space for brands that include Teen Vogue, Cosmopolitan, EW, and more. People Editorial Guidelines Published on January 24, 2023 06:09 PM Share Tweet Pin Email Photo: Kevin Wolf/AP/Shutterstock Sesame Street co-creator Lloyd N. Morrisett has died, according to a tweet from Sesame Workshop. He was 93. "Sesame Workshop mourns the passing of our esteemed and beloved co-founder Lloyd N. Morrisett, PhD, who died at the age of 93," read the post on Tuesday from the nonprofit organization behind Sesame Street. A cause of death has yet to be revealed. Morrisett was remembered by the nonprofit as a "wise, thoughtful, and above all, kind leader" who was "fascinated by the power of technology and constantly thinking about new ways it could be used to educate." "A Lifetime Honorary Trustee, Lloyd leaves an outsized and indelible legacy among generations of children the world over, with Sesame Street only the most visible tribute to a lifetime of good work and lasting impact," another tweet added of Morrisett. Unseen Sesame Street Photos from New Photo Book Look Back at the Show's Origin Story Alongside Joan Ganz Cooney, Morrisett created the renowned children's series in 1969 in the middle of the Civil Rights movement. The organization described the show as a "simple but revolutionary idea" to help disadvantaged children prepare for school through animation, puppetry, and live-action sketch comedy. Included with Sesame's Street announcement on Tuesday came a statement from Cooney, in which she mourned the death of her fellow co-creator and emphasized his impact in children's television. "Without Lloyd Morrisett, there would be no Sesame Street," she said. " It was he who first came up with the notion of using television to teach preschoolers basic skills, such as letters and numbers." "He was a trusted partner and loyal friend to me for over fifty years, and he will be sorely missed," she added. ZACH HYMAN/Patrick McMullan via Getty 11 Mind-Blowing Facts You Never Knew About Sesame Street Morrisett received his B.A. at Oberlin College before helping to create the revolutionary television series. Following his undergraduate studies, he completed his Master's Degree in psychology at the University of California, Los Angeles, and later earned his Ph.D. in experimental psychology at Yale University. In 1970, he helped found Sesame Workshop, which prides itself as "a community built on diversity, equity, and inclusion, where creators, educators, partners, and beloved characters come together to help kids grow smarter, stronger, and kinder," according to their website. Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. Morrisett's biography on the website also states that he became a Lifetime Honorary Trustee after serving 30 years as Chairman of the Workshop's Board of Trustees for the organization.