[6] Tahir studied business economics at the University of California, Berkeley before transitioning to the performing arts, graduating with a degree in theatre.

[8] He made his film debut playing Nathoo in the Disney's 1994 live-action version of Rudyard Kipling's The Jungle Book.

[12] Tahir has guest starred on many television series, including Alias, The Practice, Family Law, The Agency, NYPD Blue, Lost, 7th Heaven, The West Wing, Walker, Texas Ranger, The D.A., 24, Monk, Justice, Cold Case, Chuck, Hawaii Five-0[13] and Warehouse 13.

[14] He also co-starred with Robert Beltran and Chase Masterson in the 2005 Sci-Fi Channel original movie Manticore.

[17] Tahir starred in the ghost horror film Jinn,[18] and in the role of Frank, Cliff Barnes' right-hand man in the revival of Dallas.

On his visit to Karachi, Pakistan, he appeared in a web series Speak Your Heart With Samina Peerzada in January 2019.