Johnson Don Phd is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Physicians & Surgeons
• Doctorate Degree

North American Industry Classification System (NAICS) Categories:

• All Other Miscellaneous Schools And Instruction > Doctorate Degree
• Offices Of Physicians (Except Mental Health Specialists)

Standard Industry Classification (SIC) Categories:

• Offices And Clinics Of Doctors Of Medicine
• Schools And Educational Services, Nec > Doctorate Degree