• Doug McKean
• Engineer

• Linda Perry
• Guitar, Keyboards, Producer

• DJ Skribble
• Mixing

• Mark "Spike" Stent
• Mixing

• Scott Storch
• Producer

• Phil Tan
• Mixing

• Rob Cavallo
• Producer

• Jeremy Wheatley
• Producer, Mixing

• Dan Sullivan's Shamrock Band
• Arranger, Remixing

• Fatboy Slim
• Producer

• Jason Nevins
• Producer, Remixing

• Timbaland
• Producer

• Charles Roane
• Producer

• Davidson Ospina
• Arranger, Remixing

• Lenny Bertoldo
• Producer, Remixing

• Steve McGuinness
• Keyboards

• Carl Rowatti
• Mastering

• Craig J. Snider
• Programming, Producer

• Mark Verbos
• Producer, Remixing

• Simon Thornton
• Engineer, Mixing, Mastering

• Steve Mac
• Producer, Mixing

• Brio Taliaferro
• Producer

• Josh Gabriel
• Piano, Bass (Electric)

• Al Hemberger
• Engineer

• Andy Manston
• Producer, Remixing

• Christina Aguilera
• Producer

• Desi "Dezrock" Caruso
• Producer, Remixing

• Julian Napolitano
• Producer, Remixing

• Dave "the Wave" Dresden
• Vocals (Background)

• Wayne Allison
• Engineer

• Stuart Price
• Producer, Remixing

• Vic Latino
• Producer, Remixing, Mixing

• Aaron Brougher
• Music Clearance

• Peter Luts
• Producer

• Conrad Golding
• Engineer

• Eddie Cumana
• Producer, Overdubs, Vocal Producer, Vocal Engineer, Editing

• Christian Dwiggins
• Mastering

• Naweed "Dirty" Ahmed
• Mastering

• Ryan Leslie
• Arranger, Producer, Programming, Instrumentation, Mixing, Engineer

• Ryan Tedder
• Vocals

• Lionel Deluy
• Photography

• Offer Nissim
• Producer

• Jan Burton
• Vocals

• Jonathan "JR" Rotem
• Producer, Engineer

• Ian Green
• Programming, Producer

• Paul Oakenfold
• Remixing

• Chris Lord-Alge
• Mixing

• Nellee Hooper
• Producer

• Rob Lewis
• Producer