Comment by gautamcgoel

I know a guy who works at Jane Street; he was formerly one of the brightest undergrads at Caltech. He turned down an offer to do a PhD at Berkeley to take the Jane Street offer, IIRC. He is pretty idealistic and has an interesting philosophy about working in finance: he thinks moving money around isn't that societally valuable, but he donates 10-15% of his income to charity each year (I think he picks charities using the GiveWell/effective altruism methodology). In his view, the value of his lifetime charitable contributions exceeds the impact he could hope to have in pretty much any other field of endeavor, so the job is completely worth it.