Heath was the bassist for the band. He joined ten monthes after Taiji left the group in 1992. He debuted during X's New York press conference. He is also currently in possession of his own record company, M records, along with his brother.
To me, Heath seemed to be more vibrant on stage than did Taiji. Both were incredible bass players, but Heath was given a greater vocal responsibilty as it seemed he could lend a greater range to the vocals of X's songs.
Equipped with a good solid talent in musicianship and vocal talent, Heath has gone on to a successful solo career, lending his songs to such popular shows as the anime "Detective Boy Conan".