Welsh-speaker, has starred in many Welsh language dramas, comedies and entertainment programmes (for Welsh-language channel S4C).
Both he and his brother Llyr Ifans are from Ruthin, Denbighshire, Wales, UK.
His first language is Welsh, and at one time, he went to the all Welsh speaking school, Maes Garmon.
Has performed at the National Theatre and the Royal Exchange, Manchester.
Name is pronounced Reese Ee-vans.
Left Wales at age 18 to study acting in London.
Was the original lead singer for the band Super Furry Animals, leaving before the band became well known.
Has appeared in several rock promos: "Hometown Unicorn" and "God Show Me Magic" by the Super Furry Animals (both 1996), "Mulder and Scully" by Catatonia (1998), "Mama Told Me Not To Come" by Tom Jones and the Stereophonics (2000), and "The Importance of Being Idle" by Oasis (2005).
Won a scholarship to Guildhall School of Music & Drama and graduated in 1997.
Both parents were teachers.
Was engaged to Sienna Miller, having been in a relationship with her since June 2007 (March-June 2008).
He was a self-described "obsessive fan" of the 'Spider-Man' comics as a child and got the chance to play the villain (The Lizard) in the 2012 reboot The Amazing Spider-Man (2012).