HGA
  1. Hubbard Graduate Auditor. Class VII auditor. Only available to Sea Org or five year contracted Church staff. This level teaches the power processes and review auditing. It is not a prerequisite to Class VIII, however. It is delivered in Church of Scientology Saint Hill organizations. (CG&AC 75)
  2. in 1956, an HGA was also to be known as D. Scn or Doctor of Scientology abroad. (HCOB 12 Sept 56) See DOCTOR OF SCIENTOLOGY.
  3. an honor award and may be made by nomination or selection; either way it is for those who are consistently producing excellent results in their own fields and to form a grade by which these recruits can be recognized. (PAB 6)
[Current usage of the term HGA is as in def. 1 above.]

Technical Dictionary