the C. brothers did not develop the formula on their own. it was the work of the brilliant Indian mathametician S. Ramanujan

http://www.cacr.caltech.edu/~roy/upi/ramanujan.html

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.