Jo Vonlanthen

Jo Vonlanthen, a Swiss driver born in 1942, made a single Formula 1 World Championship start, driving a Williams in 1975. He was 33 years old that season, and the outing brought neither points nor a classified championship position.

His name thus belongs to the sizeable group of drivers whose Grand Prix careers began and ended within a single event, a reminder of how difficult it was to convert one opportunity into a lasting seat in the mid-1970s.