It's not like Stanford had a sub-100 program and then started recruiting the best faculty. Some might even argue that Chicago (including its business school) has been just as influential as either Harvard or MIT. The top programs are Stanford, Chicago, Princeton, Harvard, and MIT. Penn, Berkeley, Yale and a few others are also in the conversation. Good for Stanford that they made a couple of senior hires, as they've strengthened one of their fields, but this isn't big news. Stanford has never been an underdog.