In 1998, Sellers won the Spec 100 Open class in the Manufacturer's Cup, beating future Atlantic Championship rival Jonathan Macri.

[2] Sellers made his first auto racing start in a Star Mazda in 1998, before competing in the Midwestern Skip Barber Formula Dodge.

[5] In 2000, Sellers competed in the second edition of the Skip Barber National Championship; he won races at Grattan Raceway at the start of the season but lost the title to Canadian Anthony Simone.

[7] Supported by Team USA Scholarship, Sellers and teammate A. J. Allmendinger competed for a number of races in the New Zealand Formula Ford Championship.

[8] For the 2002 season, Sellers returned to the United States to race in the USF2000, joining the highly successful Cape Motorsports outfit.

In 2004, Sellers competed in all races of the championship; he claimed three podium finishes: at Long Beach, Cleveland and Denver.

Sellers also ran in the Continental Tire Sports Car Challenge for Fall-Line Motorsports, placing tenth in the championship standings.

In 2013, Sellers won Petit Le Mans in the GT class, the final ALMS event before being merged into the WeatherTech SportsCar Championship.

Everything went right in 2018, with Bryan and Madison winning the GTD Championship, as well as the 2018 12 Hours of Sebring and the NorthEast Grand Prix at Lime Rock Park.

They narrowly beat Katherine Legge in what remains the hardest fought GTD championship to date, requiring an average finish of 3rd place.

Lewis, Snow, and Sellers took the 2020 Michelin Endurance Cup, setting a record for points accrued that still hasn't been broken.

In 2021, Bryan once again teamed up with Snow in the Lamborghini, and they had much success, taking their first win at the Long Beach Grand Prix.

† Sellers car failed post-race technical inspection, forfeiting all championship points but still maintaining its finishing position in the race.

(key) (Races in bold indicate pole position; results in italics indicate fastest lap) * Season still in progress.