Ian Hart (born Ian Davies; 8th October 1964) is an English stage, television and film actor best known for playing Quirinus Quirrell in the 2001 fantasy film Harry Potter and the Philosopher's Stone, as well as portraying Joe O'Reilly in Michael Collins.
Hart was born in Knotty Ash, a district of Liverpool, Merseyside, one of three siblings, and was brought up in a Roman Catholic family. He attended the Cardinal Heenan Catholic High School and was in his teens a member of the Everyman Youth Theatre before studying drama at the now-defunct Mabel Fletcher College of Music and Drama in Liverpool. He then moved on and started acting in 1980.
From 1988 to 1991, Hart studied video production at South Mersey College (now part of Liverpool Community College). He portrayed a POUM militia volunteer in the Spanish Civil War in Land and Freedom (1995), an unemployed Liverpool shipyard worker in Liam (2000). His best known role, however, is that of Professor Quirrell in Harry Potter and the Philosopher's Stone (2001). He also provided the voice of the CGI-generated face of Lord Voldemort.
Hart has played John Lennon in three productions – as a 22-year-old Lennon a few months prior to the late 1963 British Invasion in The Hours and Times (1991), a slightly younger Lennon during The Beatles' 1960-62 Hamburg period in Backbeat (1994), and a 50-year-old Lennon (having avoided his true fate at age 40) in the Playhouse Presents television production Snodgrass (2013).
Hart played Sir Arthur Conan Doyle in the film Finding Neverland in 2004, having already played Doyle's creation Dr. Watson in a BBC One television film of The Hound of the Baskervilles in 2002, and reprising the role in 2004 in Sherlock Holmes and the Case of the Silk Stocking, with a different actor playing Sherlock Holmes.
He also played schizophrenic paparazzo Don Konkey in the FX series Dirt in 2007 and 2008.
In 2009 he played Tom Ripley in BBC Radio Four's adaptations of all five of Patricia Highsmith's "Ripliad" series.
He also played Adolf Hitler in the BBC one-off drama The Man Who Crossed Hitler, which aired in August 2011.