Before revision: The technique has been popularized by some of the six men who observed him at work, including Oswald Rentsch, a massage therapist whose interpretation has become the dominant, but not unchallenged, form.
After revision: The technique has been popularized by some of the six men who observed him at work, including Oswald Rentsch, an osteopath whose interpretation has become the dominant, but not unchallenged, form.