Counsellor - это психолог-консультант, если исходить из толкований, приведенных в медицинском словаре на
http://www.graylab.ac.uk/cgi-bin/omd?counseling и в словаре Merriam-Webster http://www.m-w.com/cgi-bin/dictionary

Counseling
The giving of advice and assistance to individuals with educational or personal problems.

Counselling
The art of listening to people and assisting them deal with their problems by weighing options, facilitating the consideration of the factors acting in that situaion. Counselling can be performed through the telephone or face to face. Ideal counselling constitutes an encounter which does not involve giving advice. Counsellors may not need to be formally trained but it is preferred that they are trained.


http://www.m-w.com/cgi-bin/dictionary
Main Entry: counseling
Variant(s): or counselling
Function: noun
Date: 1927
: professional guidance of the individual by utilizing psychological methods especially in collecting case history data, using various techniques of the personal interview, and testing interests and aptitudes.
Hope this helps :))
Olga