As a rugby player Miller played for, among others Old Wesley, Leicester Tigers, Ulster, Leinster, the Barbarians, Ireland and the British and Irish Lions.
At the same time he played association football for Leicester Celtic, a team whose former players also included Damian Duff.
He also played Gaelic football for Ballyboden St Enda's and, together with Brian Stynes, he helped them win a Dublin Under 21 Championship title in 1995.
After his spell with Leicester Tigers he returned to Ireland and initially linked up with Terenure College RFC and Ulster.
[6][7] After playing just four senior internationals for Ireland, Miller was selected by the British and Irish Lions for their 1997 tour of South Africa.
He played in five games during the tour, lining up against the Border Bulldogs, Northern Transvaal, Natal and the Free State Cheetahs.
In August 2006 he came on as a substitute for Ballyboden St Enda's in a Dublin AFL Division 1 game against Thomas Davis.
Since finishing with Gaelic football, Miller set up his own personal training company called the real golf solution.
In May 2013 Miller was appointed Head Coach of Seapoint Rugby Club, a Division 2A side in South Dublin playing in the All-Ireland League.