An orthotist is a healthcare professional who specializes in the provision of orthoses including braces or other orthotic devices. An orthotist has overall responsibly of orthotics treatment, and can supervise and mentor the practice of other personnel. They are clinicians trained to assess the needs of the user, prescribe treatment, determine the precise technical specifications of orthotic devices, take measurements and images of body segments, prepare models of the limb, fit devices, and evaluate treatment outcome. In the United States, orthotists work by prescription from a licensed healthcare provider. Physical therapists are not legally authorized to prescribe orthoses in the U.S. In the U.K., orthotists are autonomous clinicians accepting direct referrals for orthotic assessment from doctors or other healthcare professionals.