Barry Simon, mathematical physicist

I first met Barry Simon in 1965, when he was an undergraduate, and I was a research asssociate of Irving Segal at MIT. We were both attending lectures on group representations by George Mackey, given at Harvard University. In one of Mackey's lectures, Barry asked why Mackey assumed that all representations took place on a separable Hilbert space? None of us understood Mackey's reply, which was that he was assuming the continuum hypothesis, because analysis can be taken to be that branch of mathematics for which the continuum hypothesis is true.

Barry is a prolific researcher, and his publications can be found from the penultimate link on his web-site.