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While at Walt Disney Imagineering (then WED Enterprises) Alexander served as Director of Project Management for EPCOT and Tokyo Disneyland. In 1982 he moved to Universal Studios where he became Executive Producer of Universal Studios Florida from the initial creation of the park through its opening in 1990. Working with Bob Ward, he created Kongfrontation, and E.T. Adventure and Back to the Future: The Ride with Steven Spielberg. Other rides included The Funtastic World of Hanna-Barbera with Mario Kamberg and Earthquake: The Big One. After the opening of Universal Studios, Alexander started the Totally Fun Company.
After leaving Universal in 1991, Alexander first created two TV pilots for Nickelodeon. The first, Go For It was a pilot only, but lead to his writing the treatment and doing concept illustrations for the long running Nick series Guts.