Together the three brainstormed Lieberman’s concept for a simple mechanical computer, and showed a prototype at the annual Toy Fair in New York City.
(Later product packaging fleshed out the name as “Education Science Research,” but officially the company remained E.S.R., doing business at 34 Label Street in Montclair, New Jersey.)
John Godfrey, an engineer at General Electric in Schenectady, NY, brought his concepts for both Dr. Nim and Digi-Comp II to E.S.R.’s attention.
Dave Hogan, with expertise in plastic injection molding, played a pivotal role on the manufacturing side as the company's general manager.
The company purchased the Long Island-based educational game publisher EduCards, and for several years continued operation under that name, until being bought out in turn in the mid-1970s.