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Patrick Michael Callahan

Patrick M. Callahan is a licensed attorney with an extensive background in healthcare. He received his Masters of Public Health from Columbia University in New York, New York. He then earned his law degree from DePaul University’s College of Law with an additional certificate in health care law. He has worked for multiple public agencies, including the Illinois Department of Financial and Professional Regulation and the Health Care Fraud Division of the Illinois Office of the Attorney General.

He handles a wide range of health care related matters, including licensure issues for all healthcare providers and other regulated professionals, medical staff privilege disputes, medical resident disciplinary cases, Drug Enforcement Administration investigations and agreements, Department of Public Health investigations, and various civil and appellate actions.

Attorney Callahan is licensed to practice in Indiana and Illinois.

Bar Admissions:

  • Indiana State Bar
  • Illinois State Bar, 2011
  • Illinois Association of Healthcare Attorneys


  • DePaul University College of Law, 2011, J.D.
  • Columbia University, 2008, MPH
  • University of California, Santa Barbara, 2006, B.A.

Past Employment

  • Illinois Office of the Attorney General

Legal Practice Areas:

  • Health Care Law
  • Professional Licensing
  • Public Health

Published Works:

  • Illinois State Medical Society, “Physician Assistants’ Authority to Diagnose and Prescribe" (March 2014)
  • DePaul Journal of Health Care Law, “Power Allocations and Professional Hierarchy in the Illinois Health Care System” (Vol. 13.2, Winter 2011)
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