Linkin Park
- Brad Delson – background vocals (1, 4–7, 9, 13, 15, 17), bass (1, 4, 6, 15), guitar (1, 4–6, 11, 15, 18–20), backing vocals (2, 10, 12, 19), lead guitar (2, 3, 8, 10, 12, 14, 16), arranger (3), Pro Tools (9), acoustic guitar (10), additional production (10, 12), samples (10), producer (11, 18, 20) synthesizer (12), strings arranger (17)
- Joe Hahn – background vocals (1, 4–7, 13, 15, 17), DJ (1, 2, 4–6, 8–10, 12, 14–16, 18–20), samples (1–6, 8–10, 12, 15, 16, 18, 19), backing vocals (2, 9, 10, 12, 19), programmer (2, 5, 8–12, 14, 16, 19), synthesizer (10, 12, 14), producer (18)
- Rob Bourdon – background vocals (1, 4–7, 9, 13, 15, 17), drums (1–6, 8–12, 14–16, 18–20), backing vocals (2, 10, 12, 19), percussion (2, 5, 8–10, 12, 19), band member (7), producer (18), programming (18)
- Mike Shinoda – beats (1, 4, 6, 15), DJ (1), Pro Tools (1, 4, 6, 9, 15), ragga MC (1, 4, 6, 15), samples (1, 2, 5, 8, 18), guitar (2, 8), lead vocals (2, 9, 12), strings arranger (2, 5, 17), producer (3, 7, 9–14, 16–19), arranger (3), engineer (3, 9–12, 16, 20), mixing engineer (3), vocals (3, 7, 11, 13, 14, 16–20), additional vocals (4, 6, 15), keyboards (5, 9–11, 14, 16, 20), piano (9, 10, 19), rhythm guitar (9, 10, 16), synthesizer (9, 10), horn (10), lead guitar (10), strings (10), programmer (11), additional mixer (16), programming (20)
- Chester Bennington – lead vocals (1–6, 8–12, 14–17), vocals (7, 13, 18–20), guitar (9), percussion (9), producer (18)
- Phoenix – backing vocals (2, 10, 12, 19), bass guitar (2, 3, 12, 14), background vocals (5, 7, 9, 13, 17), bass (5, 8–11, 16, 18, 20), producer (18), guitar (19)
Additional musicians
- Dan Smith – cello (2)
- Larry Corbett – cello (2, 5, 17)
- Bob Becker – viola (2, 5)
- Evan Wilson – viola (2, 5)
- Alyssa Park – violin (2, 5)
- Charlie Bisharat – violin (2, 5, 17)
- Joel Derouin – violin (2, 5)
- Mark Robertson – violin (2, 5)
- Michele Richards – violin (2, 5)
- Sara Parkins – violin (2, 5, 17)
- Jay-Z – rap (3)
- Ian Hornbeck – bass (4), guitar (4)
- Eg White – guitar (11), piano (11)
- Scott Koziol – bass (15)
- Oscar Hidalgo – bass (17)
- Suzie Katayama – cello (17)
- Andrew Picken – viola (17)
- Matt Funes – viola (17)
- Armen Garabedian – violin (17)
- Gerry Hilera – violin (17)
- Josefina Vergara – violin (17)
- Julian Hallmark – violin (17)
- Mario Deleon – violin (17)
- Natalie Leggett – violin (17)
- Songa Lee-Kitto – violin (17)
- Jon Green – additional guitar (20)
Additional technical
- Don Gilmore – producer (1, 2, 4–6, 8, 15, 18, 19), recording engineer (1, 2, 4, 6, 8, 15, 19), recorded by (5)
- John Ewing Jr. – additional engineer (1, 4, 6, 15), Pro Tools (1, 4, 6, 15), engineer (2, 3, 5, 8, 19), recording engineer (18)
- Matt Griffin – assistant engineer (1, 4, 6, 15)
- Brian "Big Bass" Gardner – digital editor (1, 2, 4–6, 8, 15, 19), masterer (1, 4–6, 8, 10, 12, 15, 16, 18–20), mastering engineer (2, 3, 14)
- Jeff Blue – executive producer (1, 4, 6, 15)
- Andy Wallace – mixer (1, 2, 4–6, 8, 15, 19)
- Steve Sisco – mixing engineer (1, 4, 6, 15), assistant mixer (2, 5, 8, 19), engineer (2)
- Linkin Park – producer (2, 5, 19), executive producer (3)
- Fox Phelps – assistant engineer (2, 5, 8, 18, 19)
- David Campbell – strings arranger (2, 5, 17), conductor (17)
- Mark Kiczula – engineer (3)
- Jay-Z – executive producer (3)
- Rick Rubin – producer (7, 9, 10, 12–14, 17)
- Phillip Broussard Jr. – assistant engineer (7, 13, 17), second engineer (14)
- George Gumbs – assistant mixer (7, 13, 17)
- Nicolas Fournier – assistant mixer (7, 9, 13, 17)
- Andrew Scheps – engineer (7, 13, 14, 17)
- Dana Nielsen – engineer (7, 13, 14, 17)
- Ethan Mates – engineer (7, 9–13, 16, 17, 20), Pro Tools (9), mixing engineer (14), additional mixer (16)
- Dave Collins – masterer (7, 13, 17)
- Justin Smith – masterer (7, 13, 17)
- Neal Avron – mixer (7, 9, 13, 17)
- Lindsay Chase – production co-ordinator (7, 9)
- Stephanie Luby – production co-ordinator (7)
- Erich Talaba – Pro Tools (7, 13, 17)
- Mark Santangelo – assistant mastering engineer (9)
- Jerry Johnson – drum technician (9–12, 20)
- Josh Newell – engineer (9, 11, 20), Pro Tools (9), assistant engineer (16)
- Vlado Meller – masterer (9)
- Ryan Demarti – production co-ordinator (9, 10, 12)
- Andrew Hayes – assistant engineer (10, 12), editor (10, 12)
- Chris Galland – assistant mixer (10, 12), mixing engineer (11)
- Del Bowers – assistant mixer (10, 12)
- Manny Marroquín – mixer (10–12, 18, 20)
- Alejandro Baima – assistant mixer (11, 20)
- Warren Willis – assistant mixer (11, 20)
- Jeff Jackson – assistant mix engineer (11)
- Robin Florent – assistant mix engineer (11)
- Chris Gehringer – masterer (11)
- Emily Wright – vocal producer (11)
- Kiki Cholewka – assistant engineer (16)
- D. Sardy – mixing engineer (16)
- Ryan Castle – mixing engineer (16)
- Corin Roddick – additional production (20), additional programming (20)
- Jon Green – additional production (20)
- Andrew Dawson – additional programming (20), co-producer (20)
- Andrew Boolooki – vocal producer (20)