At the 1968 Winter Olympics in Grenoble, he won the gold medal in the individual event.

Keller also won a silver at the 1966 FIS Nordic World Ski Championships in the individual event and won the event at the Holmenkollen ski festival in 1967.

Keller received the Holmenkollen medal in 1973 (shared with Einar Bergsland and Ingolf Mork).

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