Imagineer Ed Feuer worked as a mechanical engineer and later as a project engineer on various Disney Parks attractions. He is best known for his role in designing the Mark 3 Monorails for Disneyland and the Mark 4 Monorails for Walt Disney World. As a project engineer, he contributed to The American Adventure and World of Motion attractions at Epcot Center, and also helped develop the Mark 5 Monorails for Disneyland.