Chi-A.D. is Dave Young. He started out playing synths for black metal pioneers Venom under the pseudonym VMX. Later well known for being a part of UK Hardtrance act The Secret and Goa act Chi-A.D. www.ultimae.com says:
Featuring in a number of Psychedelic DJ Top Ten's, Dave Young's musical vision was to blend the harder more percussive elements of Acid Techno with the uplifting melodic sounds of Goa Trance. November 1997 saw the UK release of his new project, CHI-A.D.