- John Frusciante – synthesizer, bass, lead guitar, keyboards, vocals, producer, art direction
- Josh Klinghoffer – synthesizer, bass, rhythm guitar, keyboards, vocals
- Chad Smith – drums, percussion
- Flea – upright bass (on "The Slaughter")
- Greg Kurstin – Wurlitzer piano (on "Of Before")
- Omar Rodríguez-López – slide guitar (on "Chances", "23 Go in to End")
- Production
- Bernie Grundman – mastering
- Jim Scott – engineer, mixing
- Ryan Hewitt – engineer
- Rene Ricard – cover painting
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- Dave Lee – equipment technician
- Vincent Gallo – photography
- Ethan Mates – engineer
- Chris Holmes – assistant
- Chris Ohno – assistant
- Alex Marshall – assistant
- Daniel Carlotta Jones - Assistant
- Serena Deakin- assistant
- Richard Scane Goodheart – design
- Charlie Clouser – orchestral programming (on "Regret" and "Chances")
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