The drug user counselor role is explored in terms of its changing natu
re over the course of the past 25 years. Initially, the drug user coun
selor could be characterized as a professional based on his or her exp
erience, or as an ex-addict paraprofessional in the language of that t
ime. Working very largely with a heroin-using clientele, the counselor
was the advisor and role model who could not be conned and, thereby,
the essential counterpart to the mental health professionals who were
entering the drug misuse field. Over time, these latter professionals
based on education have become increasingly evident and die ''professi
onals of experience'' have become less so in accord with changes in th
e demography, drug-using characteristics, and psychological functionin
g of drug user clients. Nonetheless, studies that support the particul
ar efficacy of counselors of education for all but drug user clients w
ith significant psychopathology are lacking. Moreover, aspects of ther
apeutic interaction that are more largely engaged in by ''professional
s of experience'' are threatened by the diminution in that group's num
bers and the credentialing out of nontraditional job functions. Over t
he past few years, awareness of the significance of the contributions
of ''professionals of experience'' has been reawakened by the threat o
f AIDS and the recognition of counselors' contributions to outreach an
d AIDS prevention counseling.