Atty. Diane Sue Ryan

Atty. Diane Sue Ryan

Diane Sue Ryan is a lawyer practicing tax, tax controversy and litigation. Diane received a B.S. degree from Southern Illinois University in 1978, and has been licensed for 34 years.

Chicago Chicago 34 yrs experience 34 year
Call (312) 748-0609 Book Appointment

Profile Summary

About Diane Sue Ryan at a glance

Diane Sue Ryan is an Of Counsel based in Chicago, Illinois, practicing at Skadden, Arps, Slate, Meagher & Flom LLP. They have 34+ years of legal experience, licensed to practice since 1992. Their practice focuses on irs and tax. Admitted to practice in Missouri (1992) and Illinois (2012). Educated at St. Louis University Law School (J.D., 1991) and Southern Illinois University (B.S., 1978). Serands clients in Chicago, IL and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Diane Sue Ryan is a lawyer practicing tax, tax controversy and litigation
  • Diane received a B.S. degree from Southern Illinois University in 1978, and has been licensed for 34 years
  • Diane practices at Skadden, Arps, Slate, Meagher & Flom LLP in Chicago, IL

Practice Areas Explained

Diane Sue Ryan's Areas of Practice

Each practice area below reflects the types of cases Diane Sue Ryan handles, with a brief overview of what that area of law covers.

IRS Disputes & Audits

Diane Sue Ryan is one of 2,917 irs attorneys indexed nationally. Browse irs attorneys in Illinois →

Tax Law

Tax attorneys handle IRS audits, tax debt, international tax, estate planning, and tax court litigation.

Diane Sue Ryan is one of 85,302 tax attorneys indexed nationally. Browse tax 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 Diane Sue Ryan

Where is Diane Sue Ryan's law office located?
Diane Sue Ryan's law practice is located in Chicago, Illinois. The firm is Skadden, Arps, Slate, Meagher & Flom LLP. You can contact the office directly through this profile page.
What practice areas does Diane Sue Ryan handle?
Diane Sue Ryan focuses on irs, tax. Each practice area listed reflects experience handling cases of that type in Illinois.
How long has Diane Sue Ryan practiced law?
Diane Sue Ryan has 34+ years of legal experience and has been licensed since 1992.
Where did Diane Sue Ryan go to law school?
Diane Sue Ryan earned their education at (J.D., 1991); (B.S., 1978).
How can I contact Diane Sue Ryan for a consultation?
You can contact Diane Sue Ryan 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.
St. Louis University Law School
- 1991
B.S.
Southern Illinois University
- 1978

Bar Admissions

Missouri
Admitted: 1992
Illinois
Admitted: 2012

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