He has also co-written songs for other artists, including for King & Country, Francesca Battistelli, Jamie Grace, Newsong, Hawk Nelson, Moriah Peters, Jason Gray, Citizen Way and Love and the Outcome.

Hammitt is also currently a partner with FamilyLife Ministries out of Little Rock, Arkansas, as a speaker for their "Weekend to Remember" marriage retreats.

[3][non-primary source needed] In July 2016, Hammitt partnered with Seth Mosley's Full Circle Music Company (FCM Records).

Leading up to Bowen's birth, Hammitt wrote his first solo album, Every Falling Tear (Sparrow Records).

In March 2012, Tyndale House Publishers released a hardcover children's book, I Couldn't Love You More, which is based on a song from Hammitt's album Every Falling Tear and co-written by Jason Ingram.