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Kolby was based in the United Kingdom for many years and was a successful junior single seater racer.
He was British Formula Ford champion for the Van Diemen team. He went on to become a race winner in the Formula Three series, finishing 4th in the British championship in 1999, and the American Indy Lights series. His win in Indy Lights at Kansas is one of the world's closest motor race finishes as he narrowly beat Irishman Damien Faulkner.
Before finishing in single seater racing he also competed in the Le Mans 24-hour race for the DAMS (Driot-Arnoux Motorsport) Cadillac team. He also competed in touring car races in the Danish Touring Car Challenge.
Kolby retired from racing in 2003 at a young age due to his backers going into receivership.
He was also a founding member of the I.A.G.
Complete International Formula 3000 results
(key) (Races in bold indicate pole position; races in italics indicate fastest lap.)
|2002||European Minardi F3000||INT||IMO||CAT||A1R||MON||NUR||SIL||MAG||HOC||HUN
24 Hours of Le Mans results
|2000||Team DAMS|| Marc Goossens
|Cadillac Northstar LMP||LMP900||4||DNF||DNF|
- McKevitt, Greg (2001) "Rookie Faulkner wins in impressive debut race Archived 5 June 2011 at the Wayback Machine.", RTÉ Sport, 29 April 2001, retrieved 2010-02-09
- "CHAMPCAR/CART: Surfers Paradise: Conquest Racing race report", motorsport.com, 2004-10-24, retrieved 2010-02-09
- "DTC: Season finale", motorsport.com, 2000-10-09, retrieved 2010-02-09
| British Formula Ford Champion
Jacky van der Ende