 Pierrat won the Marcialonga in 1977, and he won the bronze medal in the 50 km event at the 1978 FIS Nordic World Ski Championships in Lahti, becoming the first person from France to win a medal at the championships.Pierrat's best career World Cup finish was a second in a 30 km event in Italy in 1982.All results are sourced from the International Ski Federation (FIS).