Atty. John Michael Callahan

Atty. John Michael Callahan

John Michael Callahan is a lawyer practicing medical malpractice, life sciences & biotechnology, mergers & acquisitions and 7 other areas of law. John received a B.A. degree from University of Notre Dame in 1990, and has been licensed for 32 years.

Chicago Chicago 32 yrs experience 32 year
Call (773) 273-6359 Book Appointment

Profile Summary

About John Michael Callahan at a glance

John Michael Callahan is a Partner based in Chicago, Illinois, practicing at Mcdermott Will Emery Llp. They have 32+ years of legal experience, licensed to practice since 1994. Their practice focuses on medical malpractice, business, m&a, and health care. Admitted to practice in Illinois (1994). Educated at University of San Diego School of Law (J.D., 1994) and University of Notre Dame (B.A., 1990). Active member of Chicago, Illinois State and American Bar Assns and American Health Lawyers Assn. Serands clients in Chicago, IL and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • John Michael Callahan is a lawyer practicing medical malpractice, life sciences & biotechnology, mergers & acquisitions and 7 other areas of law
  • John received a B.A. degree from University of Notre Dame in 1990, and has been licensed for 32 years
  • John practices at McDermott Will & Emery LLP in Chicago, IL

Practice Areas Explained

John Michael Callahan's Areas of Practice

Each practice area below reflects the types of cases John Michael Callahan handles, with a brief overview of what that area of law covers.

Medical Malpractice

Medical malpractice lawyers represent patients harmed by negligent doctors, hospitals, and other providers. Free case review, no fee unless you win.

John Michael Callahan is one of 49,086 medical malpractice attorneys indexed nationally. Browse medical malpractice attorneys in Illinois →

Business & Corporate Law

Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.

John Michael Callahan is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Illinois →

Mergers & Acquisitions

John Michael Callahan is one of 49,731 m&a attorneys indexed nationally. Browse m&a attorneys in Illinois →

Health Care Law

Health care attorneys for HIPAA, Medicare, Medicaid, regulatory compliance, and medical licensing matters.

John Michael Callahan is one of 66,735 health care attorneys indexed nationally. Browse health care attorneys in Illinois →

Jurisdictional Context

Why local counsel matters in Illinois

Practicing law in Illinois. Legal matters in Illinois are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Chicago are typically filed in the local municipal court or the appropriate Illinois state district court, depending on subject matter and amount in controversy. An attorney licensed in Illinois brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Illinois courts without local counsel or pro hac vice admission.

Looking for additional Illinois attorneys? Browse all attorneys in Chicago or all attorneys in Illinois.

Frequently Asked

Common questions about John Michael Callahan

Where is John Michael Callahan's law office located?
John Michael Callahan's law practice is located in Chicago, Illinois. The firm is Mcdermott Will Emery Llp. You can contact the office directly through this profile page.
What practice areas does John Michael Callahan handle?
John Michael Callahan focuses on medical malpractice, business, m&a, health care. Each practice area listed reflects experience handling cases of that type in Illinois.
How long has John Michael Callahan practiced law?
John Michael Callahan has 32+ years of legal experience and has been licensed since 1994.
Where did John Michael Callahan go to law school?
John Michael Callahan earned their education at (J.D., 1994); (B.A., 1990).
How can I contact John Michael Callahan for a consultation?
You can contact John Michael Callahan directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.

Education

J.D.
University of San Diego School of Law
- 1994
B.A.
University of Notre Dame
- 1990

Bar Admissions

Illinois
Admitted: 1994

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