There are several machines that scholars still debate if they were the first supercomputer, different people were involved with each, no one person made any of them:
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The word is invent ... there weren't any lying around to be discovered.
Charles Babbage built the first working computer (in 1822),
it was based on a design by J H Mueller done in 1786.
I believe it was Steve Jobs who found the Macintosh Computer, however a little bit later Bill Gates found the PC as well.