Who was Mort in David Crosby's autobiography Long Time Gone?

Mort is the alias name. David Crosby refused to tell the "real name" of Mort in order to protect his identity. (As Mort was involved in serious drug-related issues). Mort served a few purposes in Crosby's life. Number one was as his freebase dealer. Crosby describes Mort as, "The functional free-baser, if there ever was one." Mort was clean shaven, well dressed, and put up a "good front." In fact, Mort didn't like being around free basers who didn't put up a "good front" because he was afraid that it would ruin his reputation as a "well put-together free baser." Mort's other purpose in Crosby's life was as his "manager." Crosby and "Mort" entered a drug-dealing business together wherein Mort would furnish the free base to Crosby and in return would receive a portion of Crosby's royalty money, profit from touring, promotions, etc. Eventually Mort proved to be the worst free-baser of all--not nearly as "put togeter" as he would reference. Mort died at the hands of the pipe himself. Crosby came clean.