David Layfield. His primary practice is as an Occupational Therapist, also practicing as an Occupational Therapist: Feeding, Eating & Swallowing, an Occupational Therapist: Human Factors, an Occupational Therapist: Low Vision, an Occupational Therapist: Neurorehabilitation, an Occupational Therapist: Physical Rehabilitation, and an Occupational Therapist: Pediatrics.