Wietzes was born in Assen, Netherlands in 1938, and emigrated with his family to Canada when he was 12 years old. He participated in two Formula One World Championship Grands Prix, debuting on 27 August 1967 in the inaugural Canadian Grand Prix at Mosport. He retired on lap 69 with wet electrics and was subsequently disqualified for receiving outside assistance. Wietzes also participated in the 1974 Canadian Grand Prix with a rented Brabham BT42 but again retired with a transmission problem. He scored no championship points. Wietzes later experienced success in the F5000 class and won the 1981 Trans-Am Series. In 1993, he was inducted into the Canadian Motorsport Hall of Fame.