Clair Davies, NCTMB (deceased) was nationally certified in therapeutic massage and bodywork, and gained an interest in massage when he successfully self-treated his own frozen shoulder using medical textbooks on muscle pain. He went on to develop a complete system for self-treating myofascial trigger points using simple tools. Ambert Davies is a certified myofascial trigger point therapist, massage therapy educator, and author. Ms Davies offers continuing education to professional therapists and teaches self-treatment to people in pain. David G. Simons (deceased) was coathur of Travell & Simons' Myofascial Pain and Dysfunction: The Trigger Point Manual.