🇺🇸 Spencer Pumpelly

Spencer Pumpelly is a semi-professional endurance racing driver competing across IMSA's national pro-am and multiclass championships. He holds an FIA Silver grade and drives for RS1, a competitive team that has won 52 races across the index. His primary campaigns are in GT4 America and IMSA Pilot Challenge, where he drives production-based and purpose-built GT cars in fields mixing amateurs with Gold-graded professionals.[1]

Pumpelly has been active in IMSA endurance racing for fifteen seasons since 2007, building a record of 15 wins and 40 podiums across 187 starts. He won the 2026 GT4 America championship with RS1 and the 2016 IMSA Pilot Challenge title with BGB Motorsports, establishing himself as a reliable front-runner in those series. His WeatherTech record spans thirteen seasons with Magnus Racing, yielding a single win among eight podiums from 73 starts; his Pilot Challenge record, the basis for his 2016 championship, produced five wins from 72 starts. He has also raced GT World Challenge America and International GT at a competitive level, taking multiple wins in both.[2]

Against the drivers he meets most regularly, Pumpelly runs mid-field. He finishes consistently behind Robby Foley, a Gold-graded champion of 2025 GT World Challenge America Pro-Am, but sits closely matched with Stevan McAleer, another Gold professional who has raced the same IMSA series at length. He has beaten drivers of significantly higher standing on occasion; he finished ahead of Kyle Kirkwood, an elite professional who won the 2021 Indy NXT championship and raced IndyCar, six times across their meetings, and similarly outfinished Chase Briscoe, the 2016 ARCA champion, in six encounters. These results come against the context of Pumpelly's 73 starts in WeatherTech and his years in Pilot Challenge, where the stronger drivers typically dominate the podium.