He was born in Twistringen,[1] and raised on his father's farm in Bowrede near Hoya in Lower Saxony.

[2] He won silver at the 1975 European Championships, and decided not to compete in the 1976 Olympics as he had no horse good enough to win; his earlier mount, Simona, being too old.

[2] On 1 July 1977, Steenken broke the FEI's rules on amateurism by signing a sponsorship deal with Campari.

[2] Twelve days later, he sustained serious head injuries as a passenger in a car which crashed into a wall returning from an amateur football match in which he had played.

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