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He competed in the marathon at the 1960 Summer Olympics in Rome and finished in 36th place.
He competed in the marathon at the 1960 Summer Olympics in Rome and finished in 36th place.
He held the Dutch records in the 10,000 m from 1956 to 1958 and in the Marathon from 1960 to 1969. Künen started training in running at age 20, while working as a sports instructor at the Dutch Air Force. The 1960 title was his first attempt at marathon, and it set a new national record.
Internationally, Künen competed in country matches and International Military Championships, winning the 5,000 m in 1956.