- 30 Seconds to Mars
- Jared Leto – vocals, guitar
- Tomo Miličević – guitar, violin, keyboards, synthesizers, programming
- Shannon Leto – drums, percussion
- Matt Wachter – bass guitar, keyboards, synthesizers
- Additional musicians
- Matt Serletic – piano on "The Kill"
- Oliver Goldstein – additional synthesizer on "Attack", "From Yesterday" and "Savior"
- String players on "A Modern Myth"
- Caroline Campbell – violin
- Neel Hammond – violin
- Miguel Atwood-Ferguson – viola
- Vanessa Freebairn-Smith – cello
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- Production
- Produced by Josh Abraham and 30 Seconds to Mars
- Engineered and mixed by Ryan Williams
- Assistant engineer: Brandon Belsky
- Additional engineering by Brian Virtue
- Mastered by Brian Gardner at Bernie Grundam Mastering (Hollywood, Los Angeles, California)
- Mixed at Pulse Recording (Los Angeles, California)
- Additional information
- All songs were written by Jared Leto, except "Battle of One", "From Yesterday" and "Savior" which were written by 30 Seconds to Mars
- "Attack" mixed by Tom Lord-Alge, assisted by Femio Hernandez
- "Attack" mixed at South Beach Studios (Miami Beach, Florida)
- "The Battle of One" and "Hunter" produced by 30 Seconds to Mars and Brian Virtue; engineered by Brian Virtue at CRC Studios (Chicago, Illinois)
- A&R: John Deutsch
- Wataru Hokoyama: string arranger
- Management: Irving Azoff Management
- Legal: Gary Stiffelman for Ziffren, Brittenham, Branca & Fischer
- Business management: Dian Vaughn for Loring Ward
- U.S. booking: John Marx, John Branigan for William Morris
- International booking: Mike Greek for Creative Artists Agency UK Ltd
- Creative direction and design: 30 Seconds to Mars and Sean Mosher-Smith
- Photography: Olaf Heine
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