He was known for his dark, moody style of songwriting created through his frequent usage of dissonant passages and diminished chords.
He made his recording debut in 1990 with the band on their second album Twisted into Form, co-writing much of the material and bringing a darker and more progressive sound than its predecessor, Forbidden Evil.
After the dissolution of Forbidden, Calvert was asked to replace Pat O'Brien in the progressive thrash metal band Nevermore.
Dane stated in an interview he and Sheppard were amazed by Calvert's technique and were very happy when Tim accepted their invitation.
[1] Calvert left Nevermore in 2000 after the Dreaming Neon Black tour ended to pursue a full-time career as a pilot, attending school and working in Seattle initially before moving to San Luis Obispo, California for his first assignment, then Salt Lake City, Utah and later Minneapolis, Minnesota.