Following the surgery and after being de-hypnotized, the patient stood up from the gurney, asked for a sip of water and walked to her wheelchair to return to her room. She is quoted as saying, "I felt no pain. I could only feel pressure and what seemed like tugging at my throat." The procedure was captured for the first time in the film "Thyroidectomy Under Hypoanesthsia". Kroger also participated in anesthetizing an expectant mother in "Hypnosis in Obstetrics", which was also the first occasion on which hypnotism's use in delivery was filmed. Both educational movies were intended as teaching aids at medical schools, hospitals and scientific meetings and were produced by Wexler Films (now out of business). The first film was rereleased and included on DVD with the second edition of "Clinical & Experimental Hypnosis". The text, featuring an introduction by Michael D. Yapko, is a republication of the second edition, originally printed in 1977; the first edition was published in 1963. He also produced the medical film "Hypnosis in Dentistry". An early member and co-founder of the Society for Clinical and Experimental Hypnosis (SCEH), a professional hypnosis society for researchers founded in 1949, Kroger later co-founded the American Society of Clinical Hypnosis with Milton H. Erickson, which included clinicians into their ranks. He was also founder of the Institute for Comprehensive Medicine and the International Society for Comprehensive Medicine, and the Academy of Psychosomatic Medicine. Kroger organized and conducted multiple-day teaching seminars at major medical schools and medical societies from 1950 to the 1980s. The journal "Psychosomatics" was launched during his tenure as head of the Academy of Psychosomatic Medicine, and he served as its associate editor. Kroger was also the associate editor of "Mind"; consulting editor of "The Journal of Sex Research"; advisory editor of the "International Journal of Clinical and Experimental Hypnosis"; associate editor of "Existential Psychiatry" and consulting editor of the "Western Journal of Surgery, Obstetrics and Gynecology" where he wrote a guest column entitled "Psychosomatics and Hypnosis". His textbook, "Clinical and Experimental Hypnosis", was described as being a "definitive textbook on the subject" and defined and shaped the field of hypnosis for over 20 years after its publication. Through the text and his own seminars put on by the ASCH, he changed the perception of hypnosis as being a novelty to a legitimate and respected medical option.