Damian was lead singer for Landmarq and recorded four non-Progressive singer-songwriter solo studio albums (Cosmas, Disciple, Live in Rehearsal and Let's Start a Commune). Aside from performing as a solo artist, he has often performed with several guest musicians as the Damian Wilson Band. The last DWB tour was filmed and released on DVD. He has also worked on projects with Ayreon and Gary Hughes. Damian has also worked with Rick Wakeman's English Rock Ensemble, Guy Fletcher, Aina, After Forever, Mostly Autumn and Praying Mantis. He played the lead role of Jean Valjean in Les Misérables on their UK National Tour.
In 2007, Wilson returned to Threshold as replacement for lead vocalist Mac for the "Live Reckoning" tour. A new Threshold album came since he left the band in 2012.
In November 2011 Damian released a retrospective double album called I Thought The World Was Listening. 1997 – 2011 containing 31 remastered songs, including new versions and previously unreleased material.
In March 2012, his first album Cosmas was re-released as Cosmas - Remastered.
Shadowland - Mad as a Hatter – 1996 (Backing vocals on "Salvation Comes")
Revealing Songs of Yes -2001 (Lead vocals on "Going For the One" & "And You & I")
After Forever- Emphasis (Single) – 2001 (Lead vocals on "Imperfect Tenses" & "Who Wants to Live Forever")
Shadowkeep- A Chaos Theory – 2001 (Backing vocals)
Wicked Sensation- Reflected – 2002 (Backing vocals on "You're the Answer", "Stand Tall", "Highspeed Chase", "The Preacher", "Night on Fire", "Caught in a Fantasy", "Let it Ride", and "Joker in the Pack")