Born and raised in London
Father abandoned family eighteen months after Callow's birth (date approximate)
On the basis of a fan letter to Laurence Olivier, was offered and took a job in the National Theatre box office
Made professional stage debut in "The Thrie Estates" at the Assembly Hall, Edinburgh
In the mid-1970s joined a traveling acting group, the Gay Sweatshop
Performed in repertory productions at Lincoln and Edinburgh
London stage debut at the Open Space
Appeared on London stage in such productions as "Plumber's Progress", "The Doctor's Dilemma" and "Soul of the White Ant"
Appeared in such BBC specials as "Instant Enlightenment", "Wings of Song" and "Man of Destiny"
Joined the National Theatre Company; where he originated the role of Mozart in their premiere production of "Amadeus"
Feature acting debut, "Gossip"
Director of such stage productions as "The Infernal Machine" (also translator) and "Jacques and His Master"
First collaboration with Merchant-Ivory, "A Room With A View"
Acted in TV-movie, "David Copperfield" for "Masterpiece Theater"
Made feature film directorial debut, "The Ballad of the Sad Cafe"
Starred on the London stage in "The Importance of Being Oscar", a one-man show about Oscar Wilde
Had supporting role as the Master of Revels (censor) in "Shakespeare in Love"
Delivered an hilarious turn as the leader of a New Age Men's group in "Bedrooms & Hallways" (released in the USA in 1999)
Cast as Rupert Halliday in the mini series "Trial & Retribution"
Cast in the HBO drama "Angels in America" based on the play by Tony Kushner
Cast opposite Dianne Wiest in "Merci Docteur Rey"
Cast in Andrew Lloyd Webber's "The Phantom of the Opera," the screen adaptation of the long-running stage musical