Sean M. Hamann - a Chicago, Illinois (IL) Corporate Contractual Valuation and Enforcement Lawyer

Chicago Corporate Contractual Valuation and Enforcement Lawyer

Updated: 03/10/2026

Areas of Practice

Corporate Contractual Valuation and Enforcement
Pre and Post Decree Family Law Matters
Appellate Matters
Child Custody and Support
Complex Asset Valuation and Division
Prenuptial Agreements
High Net Worth Divorces

Attorney Information

Overview

Mr. Hamann is a Partner with Lake Toback DiDomenico, having joined the firm in 2013. Prior to joining the firm, Mr. Hamann was engaged in private practice, focusing primarily on corporate contractual valuation and enforcement, pre and post decree family law matters, and appellate matters.

Since joining the firm, Mr. Hamann has utilized his business background to concentrate his practice on litigation and alternative dispute resolution for high-net-worth individuals, prenuptial and postnuptial agreements, and complex litigation, ranging from executive liability, to private business valuation and division, reasonable retained earnings and compensation, calculation and valuation of Restricted Stock Units and equity grants, fraud and fraudulent transfers, trust agreements, asset tracing, matters of parental rights and responsibilities, and the valuation and division of estates.

In addition to his practice at the trial level, Mr. Hamann has appeared before every appellate district in the State, as well as the Illinois Supreme Court, having represented clients on dozens of appellate matters.

Mr. Hamann has also appeared repeatedly in the Northern District of Illinois, representing clients on matters of international child abduction and alleged violations of the Hague Convention.

Mr. Hamann has also appeared throughout the country, when retained pro hac vice for clients who have complex needs outside of the state, having appeared in matters in New York, Wisconsin, and Nevada.

While Mr. Hamann has enjoyed a great deal of success for clients in litigation, he takes particular pride in being able to resolve high-conflict matters by agreement, whether financial or child-related. It is the ability to litigate when necessary that helps drive Mr. Hamann to advocate for reasonable resolutions by agreement, whenever possible.

Awards and Honors

Super Lawyers® Selectees

Sean M. Hamann included in a Super Lawyers® list

Honors

American Institute of Family Law Attorneys – 10 Best Attorneys: Exceptional and Outstanding Client Service 2016 - present
Judges of the United States District Court: Northern District of Illinois – award for excellence in pro bono service 2016
Attorney and Practice Magazine: Top 10 Family Law Attorney – State of Illinois 2018
Leading Lawyers: Emerging Lawyers – Family Appellate Law
Leading Lawyers: Emerging Lawyers – Family Law
Super Lawyers: Rising Stars
Best of the Best: Top 10

Other Sources of Feedback About Sean M. Hamann

Included on the 2026 Illinois Super Lawyers list

Past Lists

2025 Illinois Super Lawyers list
2024 Illinois Super Lawyers list
2023 Illinois Super Lawyers list
2022 Illinois Super Lawyers list
2021 Illinois Super Lawyers list
2020 Illinois Super Lawyers list

Education

Legal Education
- The John Marshall Law School, Chicago, Illinois
  Honors: cum laude
  Honors: CALI Excellence for the Future Award in the Field Of Corporation Law
  Honors: Alternative Dispute Resolution Certification
  Honors: Trial Advocacy Certification
Non Legal Education
- Kelley School of Business at Indiana University, Bloomington
  B.S.
  Major: Marketing and Management

Current Employment Position(s)

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Partner
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Past Positions

Honorable Ronald F. Bartkowicz, Extern
Cook County Public Defender's Office: Felony Trial Division, Law Clerk

Bar Admissions

Illinois
U.S. District Court Northern District of Illinois
Supreme Court of the United States of America
U.S. Court of Appeals 7th Circuit

Other Affiliations

American Institute of Family Law Attorneys, 2016 - Present (Member)
U.S. District Court, Northern District of Illinois, Settlement Assistance Program
Chicago Bar Association (Member)

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Contact

Chicago, IL

33 North Dearborn Street
Suite 1850
Chicago, IL 60602

Directions

Phone: 312-288-8985

Fax: 312-726-2385

Email: Send a message

Websites:

Credit Cards Accepted

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Sean M. Hamann - Chicago, IL