Sean M. Hamann - Chicago, IL
Attorney at Lake Toback DiDomenico
Corporate Contractual Valuation and Enforcement Lawyers in Chicago, IL
33 North Dearborn Street Suite 1850 Chicago, IL 60602
- Free Consultation
- 1 Super Lawyers®
-
15
Years
Experience
Chicago Corporate Contractual Valuation and Enforcement Lawyer
Updated: 07/13/2026
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
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, 2011
J.D.
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, 2007
B.S.
Major: Marketing and Management
Current Employment Position(s)
-
Partner
Past Positions
- Honorable Ronald F. Bartkowicz, Extern
- Cook County Public Defender's Office: Felony Trial Division, Law Clerk
- Goodwin, Hamann & Associates, LLC, Attorney, 2012 - 2015
Classes and Seminars
-
Much Shelist in house CLE: Changes in Family Law, 2016
- Business Valuation, Financial & Tax Issues in Divorce: Determining "Income" of pass-through entities for support purposes, 2016
Representative Cases
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In re Marriage of Altman and Block, 2016 IL App (1st) 143076
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In re Marriage of Asta and Pappas, 2016 IL App (2d) 150160
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In re Marriage of Ammar, 2015 IL App (1st) 133722-U
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In re Marriage of Lyman, 2015 IL App (1st) 132832
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In re Marriage of Iqbal and Kahn, 2014 IL App (2d) 131306
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In re Marriage of Frasier, 2014 IL App (2d) 130509-U
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In re Marriage of Spaniak, 2011 D 5084
Bar Admissions
- Illinois, 2011
- 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, 2011 - Present (Member)
Photo
Contact
33 North Dearborn Street
Suite 1850
Chicago, IL 60602
Phone Number: 312-288-8985
Fax Number: 312-726-2385
Email: Send a message
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