Warner lost a leg in a car crash in 1988. Having previously intended to make a career in hockey, he subsequently embarked on a career in skiing.[4] In addition to the Paralympic Games, he has competed in events such as the Disabled World Championships.[5]
South Africa made its Paralympic Games début at the 1998 Winter Paralympics in Nagano, Japan. Warner was his country's sole representative. He entered four events, all in alpine skiing, in the LW2 category.
In the Men's downhill, he finished 25th (out of 30), with a calculated time of 1:19.25.
In the Men's giant slalom, he finished 19th (out of 37), with a calculated time of 3:08.90. Only 21 competitors out of 37, however, successfully completed the event.
In the Men's slalom, he finished 20th (out of 38), with a calculated time of 2:21.57. Only 25 competitors reached the finish line.
In the Men's super-G, he finished 21st (out of 34), with a calculated time of 1:25.61. 26 competitors reached the finish line.[7]