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EARLY LIFE
Callis grew up in London where he attended Harrow School in North West London. In 1990, he went on to study for a BA in English and Related Literature at the University of York, where he was a member of Derwent College. At university he was a keen student actor, director, and writer, sometimes also appearing in productions put on by friends at Cambridge University, including a production of Harold Pinter's The Birthday Party. He graduated from York with a 2.2 in 1993.

CAREER
Callis subsequently went on to the London Academy of Music and Dramatic Art, from which he graduated in 1996, and in the same year he was awarded the Jack Tinker Award (Theatre Record Critic of the Year) for Most Promising Newcomer for his performance in Old Wicked Songs, a two-hander by Jon Marans, in which he starred alongside Bob Hoskins..
Callis has appeared in various West End productions and television series as well as on radio. He has also been involved in writing and directing. His directional debut was Beginner's Luck, a co-production of his and writer/director Nick Cohen's Late Night Pictures and Angel Eye Film & TV, starring Julie Delpy, Steven Berkoff, and Fenella Fielding. Beginner's Luck was critically panned, but ran for almost three weeks on one print (all the low-budget film could afford) in one cinema in central London, then went on a tour of student cinemas around the U.K. The U.K. distributor was Guerrilla Films. The film is still on the Icon Catalogue.
Callis finished filming his first role in a cinema film, Bridget Jones's Diary, alongside Renée Zellweger & Hugh Grant, in the summer of 2000 and between a few further film and TV roles went back on stage in the Soho Theatre in December 2002.
In 2003, Callis landed the role of Dr. Gaius Baltar in the re-imagined Battlestar Galactica miniseries, and has continued the role in the regular series that followed.
In 2006, Callis won Best Supporting Actor Saturn Award, a Peabody Award, and an AFI award (all Battlestar-related)

PERSONAL LIFE
Callis has two sisters. He lives in London, with his wife Neha, and their sons Joshua and Sacha, who were born in 2003 and 2005, respectively. Apart from acting, directing, and writing, he writes music, and plays piano and guitar.