My grandfather started Mauchly Associates with John Mauchly, he was Mauchly's "business guy" because he had experience in computers while working at Remington Rand on the Critical Path Method[1] in the 50s. My mom remembers John telling her about someday they're going to make computers that can fit in a briefcase while the smallest computers at the time were the UNIVAC. Not sure why you don't hear much about Mauchly Associates, it's not even on his Wikipedia page...
[1]: https://en.wikipedia.org/wiki/Critical_path_method