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 Operating Officer
Dr. Greg Hansen brings a rare blend of clinical expertise, operational leadership, and technological innovation to his role as Chief Operating Officer of the Medical Support Center. He oversees enterprise-wide operations spanning revenue cycle management (RCM), collections, independent dispute resolution (IDR), and accounting liaison functions, while driving strategic initiatives in software systems and advanced AI-powered charting solutions.
Dr. Hansen graduated Summa Cum Laude from Loyola University with a degree in Biology and a minor in Business Administration, earning the Ruth and Lee Faust Award as the top science graduate. His academic foundation includes dual research theses in human genetics and a competitive fellowship at the H.A. Chapman Institute of Human Genetics.
Before entering medicine, Dr. Hansen served as a Senior Consultant at a management consulting firm, where he developed deep expertise in technology integration, accounting workflows, project management, and business process optimization. He later earned his medical degree from Oklahoma State University College of Osteopathic Medicine and completed his Emergency Medicine residency at the University of Texas Southwestern–Parkland Hospital.
Clinically, Dr. Hansen has held key leadership roles including Medical Director, Director of Process Improvement, and physician sepsis liaison across three high-volume emergency departments serving over 100,000 patients annually. He has been recognized with three distinguished physician awards and has built a robust in-house scribe program to support documentation excellence.
As COO, Dr. Hansen leverages his unique dual background in medicine and business to streamline operations, enhance compliance, and implement scalable solutions that improve financial performance and clinical documentation. His leadership in AI charting initiatives positions the organization at the forefront of healthcare innovation.
Outside of work, Dr. Hansen enjoys traveling with his wife and two children, supporting their athletic pursuits, and staying engaged in family life.
