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Patrick M. Callahan

Patrick M. Callahan


Patrick M. Callahan is an experienced attorney licensed to practice law in Illinois and Indiana. He received his Juris Doctorate from DePaul University’s School of Law, a Masters in Public Health from Columbia University, and a Bachelors in Political Science from the University of California, Santa Barbara.

He previously worked for the Illinois Department of Financial and Professional Regulation and the Health Care Bureau of the Illinois Office of the Attorney General. He has a significant background in professional licensing and state and federal regulatory matters. His broad practice includes state licensing board litigation, state and federal OIG matters, DEA investigations, Medicare and Medicaid credentialing, and numerous other areas of practice.

He also teaches graduate level courses in public health at Benedictine University and the Dalian Medical University in Dalian, China.

Patrick founded The Callahan Law Firm in 2023 to ensure that healthcare professionals can access experienced and ethical legal counsel from attorneys who genuinely care about their cases.

  • DePaul University College of Law
  • Columbia University (Masters of Public Health)
  • University of California, Santa Barbara (Bachelor of Arts)
Published Works
  • Illinois State Medical Society, “Physician Assistants’ Authority to Diagnose and Prescribe” (March 2014)
  • DePaul Journal of Healthcare Law, “Power Allocations and Professional Hierarchy in the Illinois Healthcare System (Vol. 13.2, Winter 2011)
Professional Associations
  • Illinois State Bar, 2011
  • Indiana State Bar, 2022
  • American Association of Nurse Attorneys

Our Promise to You

We pride ourselves on providing a comprehensive service to our clients, which starts immediately upon us being retained. Our services do not end until a case is fully resolved, and we remain committed to helping our clients through any downstream effects. Our attorneys have a combined fifteen years of experience. We are prepared to fight for your rights and ability to work in the healthcare industry.

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