Atty. John Gregory Deis
John Gregory Deis is a lawyer practicing congressional investigations & crisis management, global anti-corruption & fcpa, health care and 4 other areas of law. John received a B.S. degree from Marquette University in 1997, and has been licensed for 23 years.
Congressional Investigations & Crisis Management & More Attorney · Serving Chicago, IL · 23+ Years Experience
Profile Summary
About John Gregory Deis at a Glance
John Gregory Deis is a Partner based in Chicago, Illinois, practicing at Mayer Brown Llp. They have 23+ years of legal experience, licensed to practice since 2003. Their practice focuses on white collar, litigation, and health care. Admitted to practice in Illinois (2003) and Indiana (2007). Educated at University of Illinois College of Law (J.D. Valedictorian, 2002) and Marquette University (B.S., 1997). Serves clients in Chicago, IL and the surrounding metropolitan area.
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About John Gregory Deis
- John Gregory Deis is a lawyer practicing congressional investigations & crisis management, global anti-corruption & fcpa, health care and 4 other areas of law
- John received a B.S. degree from Marquette University in 1997, and has been licensed for 23 years
- John practices at Mayer Brown LLP in Chicago, IL
Practice Areas Explained
John Gregory Deis's Areas of Legal Practice
Each practice area below reflects the types of cases John Gregory Deis handles, with a practical overview of what that area of law involves and how it may apply to your situation in Chicago.
White Collar Crimes in Chicago
John Gregory Deis is one of 19,824 white collar attorneys indexed nationally. Browse white collar attorneys in Illinois →
Civil Litigation in Chicago
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
John Gregory Deis is one of 450,750 litigation attorneys indexed nationally. Browse litigation attorneys in Illinois →
Health Care Law in Chicago
Health care attorneys for HIPAA, Medicare, Medicaid, regulatory compliance, and medical licensing matters.
John Gregory Deis is one of 66,157 health care attorneys indexed nationally. Browse health care attorneys in Illinois →
Jurisdictional Context
Why Local Counsel Matters in Chicago
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 venue, 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.
Chicago Courts and Legal Process
Choosing a Chicago-based attorney means your counsel already knows the local docketing timelines, preferred filing formats, and how individual judges typically rule on procedural motions — details that only come from practicing in this jurisdiction day after day. That local familiarity can translate to better strategy, faster filings, and fewer costly surprises.
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Professional Profile
Why Clients in Chicago Choose John Gregory Deis
Selecting an attorney is one of the most consequential decisions you can make when a legal matter arises. Below are the core qualities that distinguish John Gregory Deis's practice in the field of white collar, litigation, and health care.
Decade-Tested Legal Experience
John Gregory Deis brings 23+ years of hands-on legal practice — enough to have navigated the recurring fact patterns, procedural traps, and negotiation dynamics that shape case outcomes.
Multi-State Bar Admission
Licensed in Illinois and Indiana, John Gregory Deis can represent clients in cases that span state lines or require counsel in multiple jurisdictions.
Broad Practice Area Coverage
Covering white collar, litigation, and health care, John Gregory Deis can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Chicago
A Chicago-based practice means John Gregory Deis attends hearings in the same courthouses, knows the local clerks, and understands the unwritten scheduling norms that affect every case filed here.
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John Gregory Deis's Practice Areas & Specializations
Education & Law School Background
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