Atty. William S. Decarlo

Atty. William S. Decarlo

William S. Decarlo is a lawyer practicing general practice, securities & investment fraud, corporate governance and compliance and 3 other areas of law.

Chicago Chicago 49 yrs experience 49 year
Call (312) 535-4941 Book Appointment

Profile Summary

About William S. Decarlo at a glance

William S. Decarlo is a Partner based in Chicago, Illinois, practicing at Sidley Austin LLP. They have 49+ years of legal experience, licensed to practice since 1977. Their practice focuses on business, m&a, securities, and consumer. Admitted to practice in New York (1977) and Illinois (1986). Educated at Georgetown University Law Center (J.D., 1976) and University of Pennsylvania (B.S. University, 1971). Serands clients in Chicago, IL and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • William S. Decarlo is a lawyer practicing general practice, securities & investment fraud, corporate governance and compliance and 3 other areas of law
  • William received a B.S. degree from University of Pennsylvania in 1971, and has been licensed for 49 years
  • William practices at Sidley Austin LLP in Chicago, IL

Practice Areas Explained

William S. Decarlo's Areas of Practice

Each practice area below reflects the types of cases William S. Decarlo handles, with a brief overview of what that area of law covers.

Business & Corporate Law

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

William S. Decarlo is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Illinois →

Mergers & Acquisitions

William S. Decarlo is one of 49,731 m&a attorneys indexed nationally. Browse m&a attorneys in Illinois →

Securities Law

William S. Decarlo is one of 64,529 securities attorneys indexed nationally. Browse securities attorneys in Illinois →

Consumer Protection

Consumer protection attorneys for fraud, lemon law, debt harassment, and deceptive trade practices.

William S. Decarlo is one of 50,607 consumer attorneys indexed nationally. Browse consumer 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 William S. Decarlo

Where is William S. Decarlo's law office located?
William S. Decarlo's law practice is located in Chicago, Illinois. The firm is Sidley Austin LLP. You can contact the office directly through this profile page.
What practice areas does William S. Decarlo handle?
William S. Decarlo focuses on business, m&a, securities, consumer. Each practice area listed reflects experience handling cases of that type in Illinois.
How long has William S. Decarlo practiced law?
William S. Decarlo has 49+ years of legal experience and has been licensed since 1977.
Where did William S. Decarlo go to law school?
William S. Decarlo earned their education at (J.D., 1976); (B.S. University, 1971).
How can I contact William S. Decarlo for a consultation?
You can contact William S. Decarlo 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.
Georgetown University Law Center
- 1976
B.S. University
University of Pennsylvania
- 1971

Bar Admissions

New York
Admitted: 1977
Illinois
Admitted: 1986

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