Gödel and Einstein
For quite a few years, Gödel and Einstein were both at the Princeton
Institute for Advanced Study. Quoting from Albert Einstein:
Historical and Cultural Aspects (Gerald Holton and Yehuda Elkana,
editors):
The one man who was, during the last years, certainly by far
Einstein's best friend, and in some ways strangely resembled him most,
was Kurt Gödel, the great logician. They were very different in almost
every personal way - Einstein gregarious, happy, full of laughter and
common sense, and Gödel extremely solemn, very serious, quite
solitary, and distrustful of common sense as a means of arriving at
the truth. But they shared a fundamental quality: both went directly
and wholeheartedly to the questions at the very center of things.
Gödel did original work in relativity theory by finding a new
class of solutions for the field equations of general relativity, the
so-called "rotating universes" or "Gödel universes".