Created in 1998 in Los Angeles, California, United States by Jared Leto and his brother, Shannon, 30 Seconds to Mars initially began as a small family project. Matt Wachter later joined the band as bassist and keyboard player. After working with a number of guitarists (including Kevin Drake and Solon Bixler), the band auditioned Tomo Miličević to complete the band's official roster. After Wachter's departure from the band in 2006, the Leto brothers and Miličević continue on as a trio with additional touring members, including Tim Kelleher on bass.

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