Dhillon was nominated to the long-list of the 2010 National Television Awards in the category for "Best Drama Performance".
Dillon was born and raised in San Francisco, California. He spent nine months of his childhood in India. He took one acting class at UC Berkeley in his senior year at San Francisco State University. After graduation, he worked as a prison AIDS educator in California and Hawaii before setting up a theatre company in San Francisco with friends. In 1994, he attended drama school in the United Kingdom.
Dhillon was nominated to the long-list of the 2010 National Television Awards in the category for "Best Drama Performance".
Dillon originally appeared in Holby City in 2001 as recurring minor character Dr. Sunil Gupta, before returning in November 2007 as consultant Michael Spence. Dhillon took a 'extended break' from Holby City on December 17, 2013, after Michael was forced to leave his post by new CEO, Guy Self (John Michie).
On June 19, 2014, it was announced Dhillon would be returning to Holby City as Michael for a short stint in late 2014. During this time, Dhillon also starred alongside Amanda Mealing on Casualty.
