Dennis Olsen’s racing career began the moment he stepped into a go-kart at the tender age of five. By the age of 13 the Norwegian teenager was a karting champion.

Dennis Olsen primarily competes in the FIA World Endurance Championship LMGT3 class with the Proton Competition operated Mustang GT3, but the Norweigan endurance racing ace has helped expand Mustang globally by also racing in other series, which include: SRO GT World Challenge Europe, ADAC Nürburgring Langstrecken-Serie and serves as the endurance racer in the IMSA WeatherTech SportsCar Championship.

Olsen has been a part of many firsts of the Mustang GT3. In its debut season of global competition, Olsen helped lead the charge to its first-ever podium at none other than the 24 Hours of Le Mans. In 2025, Olsen also helped secure the first global victory of Mustang GT3 in the Rolex 24 At Daytona.