Ohio Rev. Code § 4755.05
No person who does not hold a current license under sections 4755.04 to 4755.13 of the Revised Code shall practice or offer to practice occupational therapy, or use in connection with the person's name, or otherwise assume, use, or advertise, any title, initials, or description tending to convey the impression that the person is an occupational therapist or an occupational therapy assistant. No partnership, association, or corporation shall advertise or otherwise offer to provide or convey the impression that it is providing occupational therapy unless an individual holding a current license under sections 4755.04 to 4755.13 of the Revised Code is or will at the appropriate time be rendering the occupational therapy services to which reference is made.
R.C. § 4755.05