In 2009 he competed for Mundill in the Star Mazda Championship, winning at the Milwaukee Mile and finishing 6th in points.

He made his Firestone Indy Lights debut for Andersen Racing on July 4 at Watkins Glen International.

He finished 20th in points.In 2017 Krohn announced he had accepted a role with NBCSN doing reports and interviews trackside at IndyCar events.

Since he began racing in the United States he has earned the nickname "The Viking" due to his Norwegian heritage.

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