He is an American actor, musician, director, and music producer, founder of the alternative rock band 30 Seconds to Mars. Oscar, Golden Globe, and SAG Award winner, he has directed productions under the name Bartholomew Cubbins.
His first appearances on television were made in the series Camp Wilder, in 1992, Almost Home, in 1993, and My So-Called Life, in 1994. His film debut took place in How to Make an American Quilt. Later he starred in the films Kidnapping (1997), Urban Legend (1998), The Thin Red Line (1998), Fight Club (1999), Requiem for a Dream (2000), Panic Room (2002), Alexander (2004), Lord of War (2005), Dallas Buyers Club (2013), and Suicide Squad (2016) among others.
He released his debut album with 30 Seconds To Mars in 2002, which was titled with the same name of the band. The album received positive reviews in general. From that moment on, the band grew in popularity and recognition around the world. The band's popularity and the sales of their second album gave Leto the opportunity to participate in the 6th Annual Hollywood Life Awards in December 2006.