Mark Oatman, MD
Dr. Mark Oatman has practiced at PPM since July 2019 and he is our Medical Director. He attended the OU College of Medicine where he received his Doctor of Medicine with specialties in emergency and family medicine. He completed his undergraduate and residency at Kansas University at Wichita. Dr. Oatman and his wife reside in Tulsa and he has three sons and four granddaughters.
Preston Hassell, APRN
Preston is a board certified family nurse practitioner. He completed his Master's of Science in Nursing from the University of South Alabama.
He is and optimist and futurist at heart. Preston's hobbies include: nutrition, physical fitness, and spending time with his wife and two young sons.
Cassie Lemaster, MSN APRN FNP-C
Cassie is a board certified nurse practitioner. She graduated with a Master's of Science in Nursing in 2020 from Cox College. She has worked in healthcare for eight years in many different areas; most recently in orthopedics and neurosurgery. When Cassie is not working, she loves traveling with her husband and cycling.