DAYTONA BEACH, Fla. – Czabok-Simpson Motorsport (CSM) today announced the signing of Irish racing driver Jonathan Browne to a multi-year deal for the team’s Porsche GT4 Michelin Pilot Challenge Grand Sport (GS) class program.
Browne will be joining previously announced Madeline Stewart as her full-season teammate starting with the second round of the 2026 Championship at Sebring, Fla. in mid-March in the team’s GS No. 3 entry.
The agreement extends through the 2027 season, with a shared team ambition to advance together into the IMSA WeatherTech SportsCar Championship by 2028.
“We’re very pleased to welcome Jonathan to the CSM program,” said Stephen Simpson, co-owner, CSM. “Jonathan is fast driver with a great deal of potential that we look forward to unlocking. While sports car racing is new to Jonathan, I am confident he will adapt quickly. Jonathan was with us for the Daytona race weekend getting involved with the team in preparation for Sebring.”
Born on 10 July 2000 in Ratoath, County Meath, Ireland, Browne developed his motorsport career through European karting before graduating to formula racing in the UK and United States. He achieved significant success in Formula Ford, including a victory at the prestigious Formula Ford Festival.
He later progressed to the Road to Indy ladder, competing in the Indy Pro 2000 and USF Pro 2000 Championships, earning multiple top five finishes and pole positions. Browne advanced to Indy NXT, racing for teams such as HMD Motorsports and Chip Ganassi Racing, and gained valuable experience in one of the world’s most competitive development series.
“I’m extremely excited to join CSM and begin this next phase of my career within IMSA competition,” said Browne. “The Michelin Pilot Challenge is an incredibly strong championship, and this multi-year partnership gives me the platform and opportunity to apply my open-wheel experience to endurance-style GT racing. I’ve spent my career in highly competitive open-wheel environments, and I’m motivated to bring that experience, discipline, to this class. CSM has a clear vision for progression within IMSA, particularly the goal of progressing into the WeatherTech Championship aligns with my long-term career ambitions.”
Browne and Stewart will contest the 2026 Michelin Pilot Challenge GS season in the team’s GS entry No. 3 Porsche 718 GT4 RS CS.