Leadership
Greg Keelen, DO, FAAEM, FACEP
CEO and Board Chair
Dr. Keelen is a distinguished healthcare leader and the visionary founder of Medical Support Center, an organization dedicated to helping physicians maintain independence and optimize practice operations. With over 35 years of experience in hospital departments and diverse healthcare roles, he has developed deep insights into the challenges and opportunities within the medical field.
Medical Support Center is managed entirely by physicians—ensuring that those who understand the profession best are the ones guiding and supporting fellow doctors. By providing essential tools and shared resources, including technology, scheduling, credentialing, and revenue management optimization, the center enables physicians to focus on patient care while running efficient, sustainable practices.
Dr. Keelen is committed to helping practices navigate regulatory challenges, such as the No Surprises Act, while leveraging economies of scale to secure better in-network rates and increase reimbursements through IDR strategies. He also educates physicians on the business side of medicine to protect them from exploitation by private equity firms and profit-driven entities that prioritize financial gain over physician autonomy and patient care.
Through physician-first payroll systems and operational efficiencies, Medical Support Center fosters an environment where medical professionals can thrive. Under Dr. Keelen’s leadership, the organization champions a model that prioritizes autonomy, innovation, and excellence—ensuring that physicians, not corporate interests, shape the future of healthcare.
Greg Hansen, DO
Chief Operations Officer
Dr. Greg Hansen, Chief Operations Officer at Medical Support Center, brings a wealth of experience in both healthcare and business operations. Graduating Summa Cum Laude from Loyola University with a degree in Biology and a minor in Business Administration, he was awarded the prestigious Ruth and Lee Faust Award as the top science graduate. His early academic focus on human genetics led to two research theses and a summer fellowship at the H.A. Chapman Institute of Human Genetics.
Before pursuing medicine, Dr. Hansen honed his expertise in technology, accounting, project management, and business process optimization as a Senior Consultant at a management consulting firm. His passion for healthcare drove him to earn his medical degree at Oklahoma State University College of Osteopathic Medicine, followed by a residency in Emergency Medicine at the University of Texas Southwestern-Parkland Hospital.
As a physician, he has made a significant impact in Emergency Department leadership, serving as Medical Director, former Director of Process Improvement, and physician sepsis liaison, earning three distinguished physician awards. Overseeing operations across multiple locations, he has played a critical role in optimizing efficiency, patient care, and revenue cycle.
In his role at MSC, Dr. Hansen leverages his extensive clinical and operational experience to empower independent physician-owned practices. He focuses on strategic solutions that enhance revenue, optimize workflows, and drive independence—helping providers compete against corporate CMG groups and navigate regulatory challenges such as the No Surprises Act. His leadership ensures that physicians retain control of their practices while benefiting from shared resources and expert business guidance.
Outside of medicine, Dr. Hansen enjoys traveling, spending quality time with his wife and two young children and supporting them in their sports activities.
