See http://www.jeanhouston.org/ for new information about what Jean Houston offers now that Mystery School has ended.
Celtic & Scottish Studies at the University of Edinburgh http://www.ed.ac.uk/schools-departments/literatures-languages-cultures/celtic-scottish-studies/home
Pacifica Graduate Institute, Santa Barbara, California, USA http://www.pacifica.edu/mythology.aspx
Scottish Storytelling Centre, Edinburgh, Scotland, UK, www.scottishstorytellingcentre.co.uk
BIBLIOGRAPHIES (downloadable link to pdf):
Celtic Studies (pending)