 The computer was initially planned by Paul Morton, Leland Cunningham, and Dick Lehmer; the latter two had been involved with the ENIAC at the University of Pennsylvania, and Lehmer had given one of the Moore School Lectures.Morton oversaw the design and construction with a team comprising electrical engineering graduate and undergraduate students at the university, more than 35 in total, including Doug Engelbart (who later invented the computer mouse) and Al Hoagland (a pioneer of the computer disk industry).The machine was first ready for use in the summer of 1953 and mostly operational in 1954.