Conversation so far:
What is Chris Amon known for?
Chris Amon is widely regarded as one of the best F1 drivers never to win a championship Grand Prix.
Did Chris Amon win anything else?
Chris Amon won eight non-championship GPs, the Silverstone International Trophy, the 1000 km Monza, the Daytona 24 Hours, the Tasman Series, and the famous 24 Heures du Mans.
Can you tell me more about the 24 Heures du Mans?
Held annually since 1923, it is considered one of the most prestigious automobile races in the world and has been called the Grand Prix of Endurance and Efficiency.
What is Chris Amon most famous for?
Chris Amon is widely regarded as one of the best F1 drivers never to win a championship Grand Prix.

Question: When did he compete?
Self-contained rewrite: When did Chris Amon compete?