Harding grew up in Sydney, Australia, with two younger brothers named Peter and James[1] and attended St Andrew's Cathedral School.

In 1993 he began a funk band Compos Mentis with his brother Peter, family friend Mike McCarthy and bass player Sam O'Donnell.

[2] In 1998 whilst studying social work at university, he auditioned for the children's musical group debut in Hi-5 from April 12, 1999.

[3] Harding was accepted and remained a core member of the group until he left it in November 2007 after suffering a broken back and toes in a motorcycle accident at Eastern Creek Raceway earlier that year and was replaced by Stevie Nicholson.

[5] Harding lives in Newcastle with his wife Tash and daughters Arielle and Beatrix[6] and works as a freelance entertainer and musician.