🇺🇸 Geoff Isringhausen

Geoff Isringhausen is a club-level driver racing solo in national multiclass GT championships. He competes primarily in PCA Club Racing, where he campaigns Porsches in the GT3, GTA2 and GTA4 classes, and holds a Bronze FIA grade, placing him among amateur drivers in the endurance and sportscar hierarchy. Since 2011 he has made 132 starts across PCA Club Racing, International GT and NASA, winning 13 times and taking 50 podiums.[1]

His most substantial record is in PCA Club Racing, where he has raced since 2012 and taken ten wins from 116 starts. He won the PCA Club Racing championship in 2019. In 2022 and 2023 he stepped up to International GT, a multiclass series mixing amateur and professional entrants, and competed in the CAY3.8 class (981-generation Porsche Cayman GT4 Clubsport), the GT4.0 class (4.0-litre Porsche 911 GT3 Cup), and the GT4.I class (modified 4.0-litre Porsche 911 GT3 Cup) across 15 starts; he won three times and finished on the podium in twelve races. His current 2025 PCA Club Racing season has yielded one podium from nine rounds, leaving him sixth in championship points.[2]

His regular rivals in club racing are closely matched to him; he races consistently alongside Harold Petit Jr., a previous PCA Club Racing GTB1 champion with 86 starts in the series, and Mike Walsdorf, a developing-level driver with 128 PCA starts. He has beaten an established professional and an IMSA-graded professional once each, Rodrigo Sales and Stevan McAleer, both drivers with substantial endurance racing credentials.