He playd the title character in the 2013 film The Lone Ranger.

Hammer was born in Los Angeles, California.His mother, Dru Ann (née Mobley), is a former bank loan officer, and his father, Michael Armand Hammer, owns several businesses, including Knoedler Publishing and Armand Hammer Productions (a film/television production company).

He has a brother, Viktor.His paternal great-grandparents were oil tycoon and philanthropist Armand Hammer and Russian-born actress and singer Olga Vadina (née Von Root).His paternal great-great-grandfather, Julius Hammer, who had emigrated from Odessa, Russian Empire, "founded the Communist Party in New York".

His mother's family is from Tulsa, Oklahoma.Hammer has described his background as "half Jewish". Hammer lived in the Dallas enclave of Highland Park for several years.When he was seven, his family moved to the Cayman Islands, where they lived for five years, and then settled back in Los Angeles.

He attended Faulkner's Academy in Governor's Harbour, Grace Christian Academy in the Cayman Islands (a school founded by his father), and later went to Los Angeles Baptist High School in the San Fernando Valley. He dropped out of high school in eleventh grade to pursue an acting career. Subsequently, he took college courses (at Pasadena City College in Pasadena, California and University of California, Los Angeles extension).

Hammer has stated that "for all intents and purposes", his parents disowned him when he dropped out of high school and began acting.

In 2010, Hammer married television personality Elizabeth Chambers; the two were introduced by Hammer's friend, artist Tyler Ramsey.

After appearing in the television series Veronica Mars, Gossip Girl, Reaper, and Desperate Housewives. Hammer played the Christian evangelist Billy Graham in Billy: The Early Years, which premiered in October 2008.[7] The film garnered Hammer a “Faith and Values Award” nomination in the Grace Award category, which is awarded for the Most Inspiring Performance in Movie or Television by Mediaguide, an organization which provides movie reviews from a Christian perspective.

He played Harrison Bergeron in 2081, based on the short story "Harrison Bergeron" by author Kurt Vonnegut, which premiered at the Seattle International Film Festival.

In 2007, Hammer was hand-picked by filmmaker George Miller, after a long search, to star in Justice League: Mortal as Batman/Bruce Wayne. The film was to be directed by Miller, but Miller left the project.

In 2010, Hammer co-starred in David Fincher's The Social Network, about the creation of Facebook. He portrayed the identical twins Cameron and Tyler Winklevoss, with Josh Pence, using CGI. Hammer stated that he had to learn how to row on both sides of a boat in order to play the twins, who are rowing champions.

His next role was in Clint Eastwood's J. Edgar, a drama about J. Edgar Hoover. He co-starred with Julia Roberts and Lily Collins in Mirror Mirror (2012), playing Prince Andrew Alcott, rather than the traditional Prince Charming.

In January 2012, he voiced the Winklevoss twins in an episode of The Simpsons titled "The D'oh-cial Network". He has been cast to play the Lone Ranger, alongside Johnny Depp as Tonto, in a 2013 adaptation of the radio and film serials,and thriller 2:22, scheduled for 2014.

In April 2013, he was announced to co-star with Henry Cavill in director Guy Ritchie's film adaptation of the 1960s TV show The Man from U.N.C.L.E..

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