Donald Robert Loomis is a former NASCAR crew chief who worked for Petty Enterprises and Hendrick Motorsports during his time as a crew chief, working most notably with Richard Petty and Jeff Gordon. Loomis won the 2001 NASCAR Winston Cup Series championship as Gordon's crew chief, and collected a total of 26 wins and 98 top 5s.

Petty Enterprises was a NASCAR racing team based in Level Cross, North Carolina, USA. It was founded by Lee Petty with his two sons Richard Petty and Maurice Petty. The team was later owned by Richard Petty, his son Kyle Petty and Boston Ventures. At the time of its folding the team operated the No. 43 and No. 45 Dodge Chargers in the NASCAR Sprint Cup Series. Petty Enterprises ran from 1949 until 2008. The team closed shop in January 2009 and merged with Gillett Evernham Motorsports after sponsorship could not be found for any of the cars in the Petty stable; the merged team took the name Richard Petty Motorsports, adopting a logo similar to that of Petty Enterprises' logo. In 2021, Richard Petty Motorsports became Petty GMS Motorsports, and in 2023 the team rebranded as Legacy Motor Club.