's campus. Mitchell and his wife Cynthia, along with the Cynthia and George Mitchell Foundation, have distributed or pledged more than $900 million in grants to causes, programs, and institutions. The vast majority of this amount is related to science,
environmental sustainability, and sustainability science-related fields, including the foundation's current grant-making programs which focus on sustainability science, clean energy, water, and natural gas sustainability. On December 7, 2010, he joined the
Giving Pledge sponsored by Warren Buffett and Bill and Melinda Gates, making public his and Cynthia's long-held private intent that the majority of their wealth would be donated to charitable causes. According to the
National Academies of Science, "In the 1970s [Mitchell] helped sponsor the work of
Dennis Meadows, whose
Club of Rome study
The Limits to Growth was a global wake-up call on the pressing need for sustainable energy technologies and food sources worldwide." Enabled by Mitchell's donation of $35 million, the Texas A&M University Physics department relocated to two new buildings in late 2009: The George P. and Cynthia W. Mitchell Fundamental Physics and Astronomy Building and the George P. Mitchell Physics Building. In 2012, he committed an additional $20 million to the Mitchell Institute for Fundamental Physics and Astronomy. This donation was the latest in a series supporting science and the physics department in particular. With previous gifts supporting academic chairs, professorships and the Giant Magellan Telescope project, the Mitchells are Texas A&M's most generous modern benefactors, with donations totaling nearly $100 million; by 2011, his total contributions to universities and research organizations had reached $159 million. Mitchell had a lifelong passion for tennis, and the tennis center at Texas A&M University, where he was captain of the tennis team, was named in his honor. Built for an estimated $4.2 million, the official ribbon cutting ceremony was held on October 23, 1998. In 1984, he was the recipient of an honorary doctoral degree from the
University of Houston. ==Personal life==