Don P. Desonier

Adjunct Professor


Don P. Desonier is the owner of Desonier Law & Mediation Services, P.S. He is a collaborative family law attorney providing full or limited representation, and a family mediator with extensive basic and advanced mediation training. He is also a contract mediator with the United States Postal Service. Don is a Certified Mediator in Domestic Relations with the Washington Mediation Association, and is an Advanced Practitioner Member of the Family Section: Association for Conflict Resolution. He is President of King County Collaborative Law. Don is an Adjunct Law Professor with Seattle University School of Law, teaching dispute resolution courses.


Curriculum Vitae


  • Chaminade University, Honolulu, Hawaii
  • J.D., University of Arizona School of Law


  • Dispute Resolution
  • Mediation and Collaborative Law