Ayn Rand's Atlas Shrugged is a good story paired with a (sometimes belabored) expression of the author's philosophy. I was wondering if there are any real-life connections to the characters of her books. Wikipedia notes (citing Rand's journal and notes) that Robert Stadler was, in part, based on J. Robert Oppenheimer. Some secondary characters are also listed there, including Nat Taggart (based on James Jerome Hill), Hugh Akston (based on Aristotle) and Mr. Thompson (based on Harry Truman). So we see that at least some of her characters were based on nonfictional characters.
What other characters, if any, were inspired by real people?
(Personal speculation without basis is not really wanted here; please don't just say "Dagny is X" without backing it up. Proofs for answers may include close readings of the text paired with relevant history, other writings by Rand, interviews with Rand, or similar.)