Karting From 2003 to 2009, Kaiser competed in the
International Kart Federation, in the IKF Regional Race Series, 2-Cycle Sprint Grand Nationals, and the Stars of Karting. In 2008, he claimed his first national championship in the HPV-1 class. In 2009, he won the Infinion Raceway 3 hr Karting Enduro.
Skip Barber Kaiser joined Skip Barber Racing School's 2009/10 Western Regional Championship, earning second place and Rookie of the Year. In 2011, he returned to the series, earning third place in the championship. That year, he also participated in the Skip Barber Karting Scholarship shootout, earning a partial season scholarship with the race series.
Formula Car Challenge In 2012, Kaiser competed in the Formula Car Challenge for World Speed Motorsports, in the Pro Mazda and FormulaSPEED classes. He earned the Pro Mazda championship title by winning eight races, and finishing on the podium in eleven out of the fourteen races.
Pro Mazda Kaiser made his professional open wheel racing debut in September 2012 in the
Star Mazda Championship at
Mazda Raceway Laguna Seca. For the 2013 season, Kaiser joined World Speed Motorsports to race full-time in the
Pro Mazda Championship. He finished seventh in the championship with a best finish of fifth (three times). He returns to the series for
2014, but switched teams to past series champions
Juncos Racing. He finished on the podium in the first race of the
2014 Pro Mazda Winterfest. He finished the 2014 season sixth in points, recording four podium finishes and earning his first professional victory at
Sonoma Raceway in the season finale.
Indy Lights For 2015, Kaiser moved up to Indy Lights with juncos racing . He scored two podiums and seven top-fives out of sixteen races, finishing sixth in the season standings. In 2016, he claimed two wins and eight podiums in eighteen races, which put him third in the final classification. He signed with Juncos Racing for a third Indy Lights season in 2017 and won the Championship to claim the $1 million scholarship to race in IndyCar.
IndyCar Kaiser announced he would move up to the Verizon IndyCar series with Juncos Racing for four races in 2018. Kaiser competed in select IndyCar Series events with Juncos between
2018 and
2019. He is best known for knocking two time
Formula One world champion
Fernando Alonso out of the
2019 Indianapolis 500 by qualifying in the last possible spot on the grid, ending Alonso's joint
McLaren/
Carlin effort. Kaiser would not compete in either the
2020 IndyCar Series or
2021 IndyCar Series, as Juncos was trying to recoup financial losses brought on by the
COVID-19 pandemic and would not be able to run their traditional Indianapolis 500 specific program which Kaiser had run in the past. When Juncos Racing was rebranded as
Juncos Hollinger Racing, Kaiser was one of the drivers that Ricardo Juncos and, new team co-owner, Brad Hollinger would consider for their first full-time IndyCar entry, which was due to be entered in the final three rounds of 2021 and from
2022 onward. The team ultimately chose
Scuderia Ferrari test driver
Callum Ilott for the full-time entry. Juncos however did not rule out bringing Kaiser on for a second car on a part time basis, including for the Indianapolis 500. ==Motorsports career results==