He co-founded The Union Underground, who played on Ozzfest 2001 and released an album An Education in Rebellion, which sold 350,000 copies.

[1] Union Underground broke up due to musical differences with Kennison forming a new band, "3-Faced", with Marty O'Brien.

[5] On Sundays in February 2022, Kennison and Heaven Below/The Iron Maidens guitarist Nikki Stringfield will perform during their residency at Hard Rock Cafe in Hollywood, California.

[9] On 24 January 2025, Kennison and Stringfield plan to release Ghost Notes, the debut EP from the husband and wife duo.

The album will coincide with the 2025 Live Drama Tour starring American heavy metal guitarist Marty Friedman.