He raced in three World Championship Formula One Grands Prix during the 1970s, debuting on 3 March 1973.

After success in South Africa driving saloons and sports cars, Keizan moved into Formula 5000[2] where he won the national championship.

He participated in the South African Formula One championships as well, including three World Championship South African Grands Prix, twice with a Tyrrell owned by Alex Blignaut – this car had been previously raced by Jackie Stewart.

For the third of his three attempts, Keizan drove a Lotus 72, entered by local outfit Team Gunston.

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