- Macy Gray – vocals (all tracks); production (tracks 1, 8); backing vocals (tracks 4, 10); executive production
- Jay Anderson – backing vocals (track 6); A&R
- Davis Barnett – viola (track 4)
- Dawn Beckman – backing vocals (tracks 2, 6, 7, 11, 12)
- Giuliano Bekor – photography
- Printz Board – trumpet (tracks 1, 8); keyboards (tracks 2, 5, 11, 12); Rhodes (track 12)
- Venus Brown – A&R
- Jeff Chestek – string recording (track 4)
- Natalie Cole – additional vocals (track 1)
- "Angry" Mike Eleopoulos – recording engineering (tracks 1–3, 5, 9)
- Scott Elgin – assistant engineering (track 3)
- Ron Fair – production, string arrangements, string conducting (tracks 1–3, 5, 7, 9); Pro Tools, recording engineering (tracks 1–3, 5, 7, 9, 12); piano solo (track 2); additional piano, Wurlitzer (track 3); organ (tracks 3, 5); piano (track 5); harmonica (track 9); executive production
- Mike Farrell – keyboards (tracks 7, 8)
- Fergie – additional vocals (track 5)
- Ghislaine Fleischmann – violin (track 4)
- Paloma Ford – backing vocals (tracks 6, 8, 9)
- Nick Fournier – assistant engineering (tracks 1, 5, 11, 12)
- Brian "Big Bass" Gardner – mastering
- Larry Gold – string arrangements (track 4)
- Jared Gosselin – production (tracks 2, 3); programming (track 3)
- Gravillis Inc. – art direction, design
- Jeremy Gregory – backing vocals, vocal arrangement (track 3)
- Bernie Grundman – mastering
- Keith Harris – percussion (track 2); drums (tracks 2, 4, 7, 12); Rhodes (track 5); keyboards (tracks 7, 11); piano (track 12)
- Tal Herzberg – recording engineering (tracks 1–3, 5, 9, 12); Pro Tools (tracks 1–3, 5, 6, 8–10, 12)
- Victor Indrizzo – drums (tracks 1, 3, 5, 11)
- Tim Izo – saxophone (tracks 1, 12); flute (track 5); clarinet (track 7)
- Eric Jackson – guitar (track 2)
- Jaycen Joshua – assistant mixing engineering (track 2)
- Gloria Justen – violin (track 4)
- Ryan Kennedy – assistant mixing engineering (tracks 8, 10)
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- Padraic Kerin – recording engineering (track 4)
- Sarah Killion – assistant mixing engineering (track 6)
- Emma Kummrow – violin (track 4)
- Mike Lett – backing vocals (track 3)
- Josh Lopez – guitar (track 3)
- Jennie Lorenzo – cello (track 4)
- Tony Maserati – mixing (tracks 8, 10)
- Glen McIntyre – backing vocals (track 6)
- Justin Meldal-Johnsen – bass (tracks 1, 2, 7, 9, 11)
- Peter Mokran – mixing (tracks 3, 5, 7, 9)
- Dean Nelson – assistant mixing engineering (track 1)
- Peter Nocella – viola (track 4)
- Noiztrip – production (track 11)
- Cassandra O'Neil – organ, piano (track 1); keyboards (track 3)
- George Pajon, Jr. – guitar (tracks 5–7, 9, 11)
- Dave "Hard Drive" Pensado – mixing (track 2)
- Jack Joseph Puig – mixing (track 1)
- Montez Roberts – assistant engineering (track 4)
- Dan Rockett – guitar (track 10)
- Jeremy Ruzumna – keyboards (track 3)
- Rafael Serrano – assistant mixing engineering (tracks 4, 11, 12)
- Mike Shapiro – percussion (tracks 2, 9); drums (tracks 6, 8, 10)
- Justin Siegel – A&R
- Caleb Speir – bass (tracks 3–5, 8, 10)
- Justin Timberlake – drums (track 4); backing vocals, keyboards, production (tracks 4, 10); guitar (track 10)
- Igor Szwec – violin (track 4)
- Doug Tyo – assistant engineering (tracks 2, 6, 8–10, 12)
- Jason Villaroman – recording engineering (tracks 1–3, 5, 6, 9, 10–12); programming (tracks 8, 10)
- Dave Way – mixing (tracks 4, 6, 11, 12)
- Eric Weaver – assistant mixing engineering (tracks 3, 5, 7, 9)
- Khalfani White – backing vocals (track 12)
- Phillip White – percussion (track 2); backing vocals, production (tracks 2, 3)
- will.i.am – production (tracks 1, 4–8, 10–12); recording engineering (tracks 4, 6); programming (tracks 5, 6, 11, 12); keyboards (track 6); executive production
- Ethan Willoughby – recording engineering (track 4)
- Frank Wolf – recording engineering (tracks 1–3, 5, 9, 12)
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