About Us


Gregory L. Mitchell

Gregory L. Mitchell, M.D. is the Owner and Medical Director of One Source Occupational Medicine. Dr. Mitchell received his undergraduate degree from Oklahoma State University and completed his medical degree in 1986 from the University of Oklahoma. After finishing residency, Dr. Mitchell began his medical career in emergency medicine and later transitioned to the field of occupational medicine. Seeing the need for better communication between physician, patient and company, Dr. Mitchell made the decision to open his own clinic dedicated exclusively to occupational medicine. For over 20 years, he has been a certified Medical Review Officer (MRO) and is also a certified Medical Examiner for the Federal Motor Safety Carrier Administration.

Darren Parsons

Darren Parsons is the Director of Operations at One Source Occupational Medicine and is the client liaison for scheduling services as well as accounts receivable and payable questions. Darren brings 25+ years of consulting and operational experience in various industries including financial services, oil and gas, and manufacturing. Upon graduating from Oklahoma State University with an MBA in 1993, Darren joined Arthur Andersen’s Business Consulting group where he specialized in process improvement and systems integration projects. For the past 20 years, Darren held a variety of roles with increasing levels of responsibility, including IT management, pricing management, forecasting, and accounting. In his most recent role as VP of Operations, Darren had overall responsibility for Global Holding’s Operations groups which included Banking Services, Customer and Company Support, New Accounts and Merchant Advance Processing.

One Source Occupational Medicine

We provide comprehensive, cost efficient, occupational medical services to more than 500 companies in the Tulsa area.