- Gretchen Anderson – producer
- Robin Antin – executive producer
- Dave Audé – programming, producer
- Steve Baughman – engineer
- Evan "Kidd" Bogart – lyricist
- Bart Buckso – electric guitar
- Glenn Camp – drums
- Mitch Cutfather Hansen – producer
- Calvo DaGr8 – producer
- LaShawn Daniels – vocal producer
- E. L. Dean – lyricist
- Greg DePante – assistant engineer
- Kara DioGuardi – producer, vocal producer
- S. Dot – producer
- Bruce Dukov – concert master
- Blake Eiseman – engineer
- Ron Fair – arranger, conductor, keyboards, producer, executive producer, vocal arrangement, string arrangements, vocal producer, wind chimes, string conductor
- Eric Live Florence – tuba
- Paul Foley – engineer
- Abel Garibaldi – engineer
- Kennard Garrett – keyboards
- Sean Garrett – programming, instrumentation
- Steve Genewick – assistant engineer
- Chris Godbey – engineer, mixing
- John Goux – guitar
- Alexander Greggs – special effects, editing
- Keith Gretlein – assistant engineer
- Daniel Groover – guitar
- Bernie Grundman – mastering
- Patrick Hayes – guitar
- Tal Herzberg – bass, producer, engineer, digital editing
- Jerry Hey – arranger, conductor
- Mike Hogue – assistant engineer, assistant
- Buffy Hubelbank – A&R
- Jimmy Iovine – executive producer
- Jonas Jeberg – programming, producer, instrumentation
- Rodney "Darkchild" Jerkins – vocals, mixing
- Melvin Jones – trumpet
- Rouble Kapoor – assistant engineer
- Chris Kasych – assistant
- Robert Kelly (R. Kelly) – arranger, producer, mixing
- Ryan Kennedy – engineer
- Clubba Langg – producer
- Daniel Laporte – engineer
- Josef Larossi – programming, instrumentation
- Gayle Levant – harp
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- Donnie Lyle – guitar
- Tony Maserati – mixing
- Jeff Meeks – programming, engineer
- Ian Mereness – programming, engineer
- Peter Mokran – mixing
- Shaffer "Ne-Yo" Smith – producer
- Candice Nelson – background vocals
- Dean Nelson – mixing assistant
- Gary Ng – A&R
- Gary Novak – drums
- Osinachi Nwaneri – producer, instrumentation
- Jordan Omley – vocal producer
- Dave Pensado – mixing
- Julian Peploe – art direction
- Jack Joseph Puig – mixing
- A. R. Rahman – producer
- Dave Rene – A&R
- Ashley Roberts – background vocals
- Matthew Rolston – photography
- Andreas "Quiz" Romdhane – programming, instrumentation
- Fareed Salamah – assistant engineer
- Nicole Scherzinger – arranger, vocals, backing vocals, vocal arrangement, vocal producer, executive producer
- Eric Schlotzer – programming, engineer
- Brian Schunck – assistant
- Tanvi Shah – lyricist
- Ryan Shanahan – assistant engineer
- Allen Sides – engineer, mixing
- Bill Airey Smith – mixing assistant
- Manny Smith – A&R
- Snoop Dogg – vocals
- Spike Stent – mixing
- Jessica Sutta – vocals, background vocals
- Ron Taylor – digital editing
- Melody Thornton – vocals, background vocals, ad-libs
- Timbaland – producer
- Mike Tocci – engineer
- Julian Vasquez – engineer
- Tito Vasquez – engineer
- Jeanne Venton – A&R
- Tommy Vicari – engineer
- Aaron Walk – mixing assistant
- Miles Walker – engineer
- Eric Weaver – assistant engineer, mixing assistant, assistant
- Frank Wolf – engineer
- Andrew Wuepper – mixing assistant
- Kimberly Wyatt – background vocals
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