A St George junior, Gasnier made his debut for the Dragons in 2000 and made an instant impact, earning his Kangaroos debut the following season against Papua New Guinea.

A talented centre, Gasnier won the Dally M Centre of the Year award in the 2006 and 2007 seasons and was a regular for the NSW State of Origin team over that period.

Gasnier captained the St George-Illawarra Dragons for the 2008 season, and was a member of the 2010 premiership winning side.

Representative Honours:
NSW City Origin - 2 (2001, 2003)
NSW State of Origin - 12 (2004 - 2006, 2008, 2011)
Australia - 15 (2001, 2005 - 2008)

Watch Mark Gasnier make his first grade debut against the Newcastle Knights in 2000