From an interview with Peter Robinson.
Peter Robinson was a speech-writer for Ronald Reagan. He then went to Stanford for an MBA and then started job-hunting. This is how he got his interviews.
Bill Buckley was a friend of Robert Maxwell, the British media baron, and Bill was kind enough to write a letter of introduction to Maxwell on my behalf.
A business school classmate's father did business with Rupert Murdoch and was kind enough to write a letter to Rupert Murdoch on my behalf.
And then a classmate was dating Steve Jobs and has since become Mrs. Steve Jobs.