I just read a New Yorker Profile in the book "Life Stories, Profiles from the New Yorker" edidted by David Remnick.  There is a whole profile about the brothers and their supercomputers. Hope this helps you.

Hello! Do you know anything about David and Gregory Chudnovsky? They built a supercomputer they named m zero. In 1992, an article appeared in the New Yorker Magazine regarding the construction of this computer and their computation of pi. Do you know if Gregory is still surviving his illness, if either one of them were hired by a university, are they still computing pi?
Any response would be appreciated.