Ann Marie Calhoun

Simpson orchestrated and conducted an arrangement of "I’ll Take It All" for Joss Stone to be used with Activision’s James Bond series games.

Simpson recorded on Stevie Nicks' 2014 album, 24 Karat Gold: Songs from the Vault.

Simpson performed again with Rahman on MTV Unplugged, and appeared with Hans Zimmer, Pharrell Williams, A. R. Rahman and Sheila E. at the 84th Annual Academy Awards in 2012.

In 2011, Simpson played with the rock supergroup SuperHeavy with Mick Jagger, Dave Stewart, Joss Stone, A. R. Rahman, and Damian Marley on their debut studio album, Superheavy, and accompanied Stevie Nicks' on the album, "In Your Dreams".

On January 13, 2010, she performed for Ringo Starr with Ben Harper and the Relentless7 on The Daily Show to promote Starr's new album, Y Not. She again played with them, with the addition of Joan Osborne, on January 14, 2010, for a performance at the Metropolitan Museum of Art, in New York City (which was recorded for the 2010 PBS show, Live from the Artists Den).

On May 17, 2010 she premiered as the lead actress, music composer, and official spokesperson for Tim Kring’s Conspiracy For Good (also known as "SPIRA").

2009 saw Simpson perform with the "First Lady of France," Carla Bruni, along with Josh Groban and Aretha Franklin, at Radio City Music Hall to celebrate Mandela Day. Simpson appeared several times with Bon Jovi, including a Christmas performance at the White House for President Barack Obama. Simpson has toured as a featured soloist with Yanni.

Simpson collaborated with Hans Zimmer, as a featured soloist and contributing writer on the film score for the 2009 film Sherlock Holmes, directed by Guy Ritchie. The score was nominated for the 2010 Academy Award for Best Score. She also collaborated with Damian Marley to score the documentary Bouncing Cats, a film that follows one man's efforts to use dance to empower youth in war-torn Uganda. She worked with Dave Stewart (her manager), and co-wrote the theme song for the charity, Stand Up to Cancer.

At the 50th Grammy Awards on February 10, 2008, Simpson was the winner of the "My Grammy Moment" contest, and played live with the Foo Fighters during the broadcast. In late February 2008, she recorded with The Hooters and played as a special guest with the band the Disco Biscuits. Later that year, Simpson performed multiple times as a special guest with the bands Switchfoot and Widespread Panic, and then performed with Ringo Starr on Larry King Live, The Late Late Show with Craig Ferguson, and at the Los Angeles House of Blues.

In 2007 Simpson became a member of Steve Vai's band, String Theories. The band began a world tour in June 2007. Simpson received a gold sales award for her participation in Vai's "Where the Wild Things Are" DVD. Her performance with Vai on "Now We Run," was nominated for a Grammy Award in the category of "Best Instrumental Rock Group Performance." Vai commented about her performance at that event: "She should have been the one who had a full performance on the show, because she would have stunned people."

In 2004, Simpson recorded the violins on the album Stand Up for the Dave Matthews Band. In 2005 she toured Italy with the North African/American band, Kantara, which performed Arab-Appalachian music. In 2006 Simpson was invited to tour with the progressive rock band, Jethro Tull, as a guest soloist. She admitted: "I had to Google 'Ian Anderson' when he first contacted me." Anderson later said of Simpson: "Unlike many of her fiddlin' friends from the classical world, Ann Marie has cultivated considerable improvisational abilities but still retains her music theory and the ability to play set parts and orchestrations."

Simpson attended the University of Virginia where she double-majored in Music and Biology, graduating in the class of 2001. While studying there she shared her bluegrass fiddle talents with Walker's Run in Charlottesville, Virginia. From 2001 to 2003, she was part of the bluegrass fusion ensemble Old School Freight Train. She also takes part in Gary Ruley and Mule Train with other members of Walker's Run.

Ann Marie Simpson-Einziger (born May 26, 1979) is an American violinist, inventor and technology entrepreneur. Ann Marie has closely collaborated with Hans Zimmer on numerous film scores, including Sherlock Holmes, Interstellar, 12 Years a Slave, The Lone Ranger, The Little Prince, Man of Steel, and Captain Phillips among many others. Ann Marie has written and performed with a wide range of artists including Pharrell Williams, David A Stewart, Skrillex, Damian Marley, Robin Thicke, Tyler the Creator, Hans Zimmer, Jethro Tull, Steve Vai, Dave Matthews Band, Ringo Starr, A.R.Rahman and Mick Jagger's group SuperHeavy and Yanni. As a serial entrepreneur and inventor, Ann Marie is the co-founder of wireless networking technology platform, MIXhalo, and also co-founder of biotechnology startup, Versicolor Technologies. Ann Marie received her education at University of Virginia, where she double-majored in Music and Biology.

She was born Ann Marie Simpson in 1979 in Virginia to a "hillbilly dad", a "documented descendant of Pocahontas", who plays banjo; and a "Chinese mom", who was a classically trained pianist. Her brothers play guitar and her sister, Mary Simpson, is an accomplished bluegrass fiddler. In 2016 she married Incubus guitarist Mike Einziger, with whom she has twin daughters, Talulah and Penelope, born in 2017. She was previously married to Brian Calhoun from 2002–2013.