He designed the first one, except for:
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Charles Babbage because he invented the "Difference Engine."
Alan Turing has been called the "father of Computer Science", having laid part of the theoretical foundations of the discipline. The epithet "father of the computer" has been variously applied to Charles Babbage, Konrad Zuse, John Atanasoff, John von Neumann, and others, to the point that the phrase no longer has any significance.
John von Neumann
John Vincent Atanasoff (ataˈnasɔf) (October 4, 1903 - June 15, 1995) was the inventor of the computer. See "Atanasoff, Forgotten Father of the Computer" (1988) by Clark R. Mollenhoff.
It could be debated that John Vincent Atanasoff is the "father of the computer." He built the first electronic computer in 1939 to 1942 as a physics professor at Iowa State University with his graduate student Clifford Berry. Although an electronic computer it was not programmable (i.e. it could only solve one type of problem: solutions of simultaneous equations) and the machine still had some problems that prevented it from fully reaching its performance goals when both Atanasoff and Berry left the university for war related work in early 1942. With increasing classroom needs due to the war the university scrapped the computer (partly because it was just a little too wide to roll out the doorway of the basement room it had been built inside) and converted the room to a classroom.