Starting in 1984, Kay was an Apple Fellow at Apple Computer until the closing of the ATG (Advanced Technology Group), one of the company's R&D divisions. He was then recruited by his friend Bran Ferren, head of R&D at Walt Disney, to join Walt Disney Imagineering as a Disney Fellow and remained there until Ferren left to start Applied Minds Inc, with Imagineer Danny Hillis, and Disney ended its Fellows program. After Disney, in 2001 he founded Viewpoints Research Institute, a non-profit organization dedicated to children, learning, and advanced software development. For its first ten years, Kay and his Viewpoints group were based at Applied Minds in Glendale, where he and Ferren continued to work together on various projects.