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—including revenue cycle management (RCM), collections, independent dispute resolution, and accounting liaison functions—while driving strategic initiatives in software systems and advanced AI-powered charting solutions.
A graduate of Loyola University (Summa Cum Laude, Biology and Business), Dr. Hansen earned the Ruth and Lee Faust Award as the top science graduate and completed dual research theses in human genetics. He began his career as a Senior Consultant in management consulting, where he gained advanced IT training and developed 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 UT Southwestern–Parkland Hospital.
Clinically, Dr. Hansen has held leadership roles as Medical Director, Director of Process Improvement, and physician sepsis liaison across three high-volume emergency departments serving over 95,000 patients annually. He has been recognized with multiple physician awards and built a robust in-house scribe program to advance documentation standards.
On the business side, Dr. Hansen has led the deployment of AI-driven RCM solutions to reduce insurance denials, monitor revenue cycle activities, and identify key roadblocks hindering collections. These initiatives improved collections by 10–18% while maintaining operating costs well below industry benchmarks. His overarching goal is to provide physicians higher reimbursements through lower operational costs while optimizing charting to improve quality across healthcare.
As COO, Dr. Hansen leverages his dual background in medicine and business to streamline operations, strengthen financial performance, and position the organization at the forefront of healthcare innovation.
