He won gold at the 2000 Summer Paralympics and held the world record for 100-metre backstroke for ten years.

He won a bronze medal in the S9 100-metre backstroke, and also competed in the S9 100-metre freestyle and the SM9 200-metre individual medley.

He won a gold medal in the S8 100-metre backstroke at the 1998 IPC Swimming World Championships in Christchurch.

[2][3] He set the S8 100-metre backstroke world record in 1998 with a time of 1:09.28,[4] which stood for ten years.

[2] He competed at the 2002 IPC Swimming World Championships and won a bronze medal in the S8 100-metre backstroke.

[5] Malone worked for Ireland's Paralympic team following his competitive swimming career.

He was the first person to be inducted into the Irish Paralympic Sports Hall of Fame.

[2] Swim Ireland awarded him as Performance Coach of the Year in Para and Diving in 2019.