Richard Edward Rainwater (June 15, 1944 – September 27, 2015) was an American investor and philanthropist. With an estimated net worth of $3 billion, he ranked 211th on the Forbes 400 in 2015. His investing style was described as "analytically rigorous but opportunistic and Texas-sized in its audacity." Rainwater was a mentor and early backer of investors including Eddie Lampert, Roger Staubach, and David Bonderman. Between 2009 and his death in 2015, he suffered from progressive supranuclear palsy, a rare disease involving neurodegeneration. During his lifetime, Rainwater donated over $380 million to charitable causes and left nearly all of his estate to his charitable foundation.