Bill Eddy is a lawyer, therapist, mediator and the President of High Conflict Institute. He developed the High Conflict Personality theory (HCP Theory) and has become an international expert on managing disputes involving high-conflict personalities and personality disorders. He provides training on this subject to lawyers, judges, mediators, managers, human resource professionals, businesspersons, healthcare administrators, college administrators, homeowners' association managers, ombudspersons, law enforcement, therapists and others. He has been a speaker and trainer in over 25 states, several provinces in Canada, Australia, France and Sweden.

As an attorney, Bill is a Certified Family Law Specialist in California and the Senior Family Mediator at the National Conflict Resolution Center in San Diego. Prior to becoming an attorney in 1992, he was a Licensed Clinical Social worker with twelve years' experience providing therapy to children, adults, couples and families in psychiatric hospitals and outpatient clinics. He has taught Negotiation and Mediation at the University of San Diego School of Law for six years and he is on the part-time faculty of the Straus Institute for Dispute Resolution at the Pepperdine University School of Law and the National Judicial College.