Krohn began his career in
karts when he was six, he spent nine years karting before moving up into car racing in 2005 as a test driver for saloon cars. In 2006, he competed in a number of
Formula Ford events in his home country, finishing in eighth, and also competing in the Ford Ford Festival at
Brands Hatch, finishing tenth, and also in the British Formula Ford Winter Series, finishing as runner up to
Brit David Mayes. Krohn entered the full UK championship the following year as well as the Finnish
Formula Three championship, "I was in a '97
Dallara with a H-pattern gearbox" Krohn recalls, "my shoulders were over the cockpit". In the UK championship, Krohn finished the year in 17th with 82 points whilst he had a better time in Finnish Formula Three with six wins and finishing second overall in the championship. He also re-entered the Formula Ford festival as well, performing better than the previous year finishing eighth. 2008 was Krohn's best year yet, with three championship wins in the Finnish, Northern European Zone (NEZ) and
Estonian
Formula Renault championships, recording ten wins in total. He also competed in the British, Italian and Northern European championships as well, but experiencing little success by comparison. With a number of successes the previous year, Krohn entered the UK Formula Renault championship for the whole season where he has so far tallied 117 points, including a win at
Thruxton. Krohn gained some notoriety during the year as well after climbing up from twenty–fifth to seventh in the wet conditions at
Donington Park but soon dropped out of the point after his suspension failed and so had to complete the final three laps on three wheels, "exactly what
Jan Magnussen would have done" commented Mark Burdett Motorsport engineer Andy Miller, who ran the
Danish driver during his 1994
British Formula 3 campaign. 2014 saw Krohn admitted into the
BMW Motorsport Junior Programme in which he trained in for three years, with established works drivers like
Dirk Adorf and
Jörg Müller. He won the
2017–18 Asian Le Mans Series GT Drivers title with Jun San Chen in the FIST-Team AAI BMW M6 GT3, and was promoted to BMW works driver in 2018. ==Racing record==