Charles Whitfield dubbed it the "Child Within". The inner child broke into the mainstream primarily through Hugh Missildine, MD, "Your Inner Child of the Past" (1963); which has retained its usefulness; and, through, Transactional Analysis (circa 1965-1969) with its model of Child-Parent-Adult, which has retained less utility. John Bradshaw's use of the "wounded inner child" is a version of the inner child skewed towards topics germane to individual and group therapy settings.