You find out about this spot after finding the party invitation in the hotel room. IT turns out he was an old college buddy of Ramos.

Last talked? Last Wednesday - play squash
Pressures work? Doing special project with small group of investors
Why secret? Kent was annoying, Ramos made a breakthrough and wanted it for himself
Details? No idea, genius
Why behind back? Kent would rush him, Bill didn't want to compromise
Anyone besides his wife? He would often work late and fall in with a smart young researcher

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