Producers, songwriters/lyricists, mixers:

Sean Michael Kelly
Tim Mathews
Nathan Meckel
Mark Niemiec

Musicians, instrumentalists, tuners:

David Dorn 
James Arledge (piano tuner)
Brent Arledge (piano tuner)
John Deaderick
Matt Anderson

Other:

Russ Zavitson (Zavitson Music Group, studio owner of Cowboy Arms Hotel and Recording Spa)
Amber Cathey (Nashville Vocal Studio, vocal instructor)