The Houston Galveston Institute is a non-profit organization that offers collaborative counselling and postmodern therapy to individuals, families and communities.
From this group, and later including Harold Goolishian's protege Dr. Neil F. Ravella and Lee Winderman, the ideas of Collaborative Language System Theory emerged.
Other contributors are Diane Gehart, Sue Levin, Diana Carleton, Lynn Hoffmann, Tom Andersen, Vivien Burr, John Cromby, Kenneth Gergen, Mary Gergen, Lois Holzman, Imelda McCarthy, Susan McDaniel, Sheila McNamee, Robert Neimeyer, David Nightingale, Peggy Penn, Sallyann Roth, Jaakko Seikkula, John Shotter, Lois Shawver, and Michael White.
HGI also provides various training programs for mental health professionals who want to develop a collaborative and postmodern approach to therapeutic work with individuals, couples, families, groups, organizations, and communities.
The Certificate Program provides practitioners across disciplines (therapy, organization development, education, and research) an intensive, in-depth study of collaborative practices based on postmodern-social construction philosophy.