Chesapeake Energy builds hydrocarbon reserves through the acquisition and development of oil and gas assets across the US. In 2015 the company had estimated proved reserves of 6 trillion cu. ft. of natural gas equivalent. Chesapeake has exploration and production assets in Appalachia, the Mid-Continent, the Barnett, Bossier, and Haynesville shale plays, the Permian Basin and the Rockies. In 2015 Chesapeake had 43,700 producing oil and natural gas wells that produced 661,000 barrels of oil equivalent per day. In 2016 its founder and ex-CEO, Aubrey McClendon, died in a single car crash following a federal bid rigging indictment.