Brendan J. Hammer

Brendan Hammer is widely known and respected by practitioners, experts, and the judiciary as a creative, effective, and experienced courtroom litigator. Since 2007, Brendan has worked both with and opposite the leading lawyers and premier law firms in Chicago and the surrounding suburbs. Previously a Partner at Berger Schatz LLP, where he worked for 15 years, Brendan affiliated with HSQ in 2022 in order to focus on providing high-touch strategic counsel and representation to his clients and to offer a suite of services that includes litigation and expert witness consulting, co-counsel services for complex litigation, and ADR Neutral work in both arbitration and mediation. Brendan is a Fellow of the International Academy of Family Lawyers (IAFL), a Fellow of the American Academy of Matrimonial Lawyers (AAML) and is also a Board-Certified Family Trial Law Advocate by the National Board of Trial Advocacy (NBTA). Brendan is an AAML Certified Arbitrator (one of fewer than a dozen in Illinois) and a Court-approved Mediator in the Domestic Relations Division of the Circuit Court of Cook County.

For almost 20 years, Brendan has worked exclusively in complex matrimonial and family law matters, representing a wide variety of clients from executives, entrepreneurs, and founders to medical, legal and creative professionals, as well as political figures, professional athletes and their spouses or intimate partners. Brendan concentrates his practice on finding intelligent, pragmatic resolutions to sophisticated family law matters including high-conflict custody and parenting disputes, complicated domestic and international child-relocation matters, the valuation and division of assets, fraud, spousal tort and dissipation claims, complex compensation structures, spousal challenges to trust and estate plans, and high net worth maintenance and child support.

In addition to working on behalf of individual clients and attorneys in both litigation and alternative dispute resolution processes, Brendan provides local, regional and nationwide strategic consulting and litigation support to private clients as well as family law attorneys and related professionals. Often teaming with custody and financial consultants and experts, Brendan assists private clients and/or their attorneys in the creation, development and deployment of litigation strategies for complex family law matters and helps facilitate the maximization and optimization of client, witness, and attorney performance – with a specific focus on persuasion and the psycho-social and performative aspects of litigation.

Brendan was previously awarded the honor of “Lawyer of the Year” for Chicago Family Law Arbitration (Chicago) by Best Lawyers in 2025 and was selected to Crain’s Most Influential Minority Lawyers in Chicago (2017), the Chicago Daily Law Bulletin’s 40 Illinois Attorneys Under 40 to Watch (2012) and is regularly awarded other honors. Brendan routinely speaks, teaches, lectures, and publishes on various family law matters—including ADR (mediation, arbitration and hybrid processes), cross examination, discovery, evidence, the intersection of forensic psychology with family law, performance aspects of litigation, trial techniques and oral argument. Certified in divorce mediation through Northwestern University over a decade ago, Brendan also previously served on the Faculty of the National Family Law Trial Institute.

Brendan brings a unique background, perspective, and set of abilities to his practice, drawing equally upon his wealth of experience in complicated family law matters, his own divorce, relocation and coparenting experience, and his background in the performing arts. While recognized by his peers and the judiciary as a zealous, effective, and articulate advocate, Brendan also is proud of his reputation in non-litigated settings as a practical, emotionally intelligent, and collegial professional. Brendan is frequently cited in mainstream media on divorce and family law matters, including in The New York Times and the Chicago Tribune.

Facebook Twitter Google Instagram

About Me

Brendan brings a unique perspective and set of abilities to his practice, drawing equally upon his wealth of experience in complicated family law matters, his own divorce and co-parenting experience, and his background in the performing arts.

Representative Cases in ADR and Litigation Venues

Successfully litigated defense of fraud claims brought by former spouse regarding valuation and sale of business owner’s company
Successful mediation of complex compensation structure issues for private equity professional and spouse
Successful mediation of complicated tort claims ancillary to high-conflict divorce
Successful mediation of child relocation issues involving California and Illinois
Multiple successful mediations of high-conflict custody disputes involving complex substance abuse and mental health issues
Multiple successful mediation of complex financial cases involving business valuation, personal goodwill, spousal maintenance, reasonable compensation, and property characterization
Successful defense against spousal challenges to multi-generational family estate plan
Successfully obtained relocation of mother and child to North Carolina despite father exercising close to equal parenting time (Judgment affirmed on appeal)
Successfully obtained relocation of mother and children to Colorado despite father exercising 50/50 parenting time for two years prior to trial (Judgment affirmed on appeal)
Successfully reduced by 80% and then eventually terminated long-term maintenance award of spouse of business executive
Successfully litigated substantial downward deviation in child support for professional athlete
Successfully maintained child custody jurisdiction in Illinois despite the presence and residency of a minor child and her mother in a foreign nation for over five years
Successful litigation of numerous motions for summary judgment regarding the characterization of business interests, trusts, and executive compensation
Successfully litigated physical and legal custody in high-conflict litigation matter despite pervasive alienation and substance abuse issues in case
Successfully litigated the dismissal of significant tort claims brought amidst high-conflict divorce matter
Successful defense against multiple attempts at post-decree maintenance modification in high-income matter and despite four-fold increase in payor’s income

Bar Admissions

Brendan is admitted to practice law in Illinois and Texas

Prior Pro Hac Vice Admission – Commonwealth of Virginia

Prior Pro Hac Vice Admission – District of Columbia

Profiles and Publications

Legal Decision Making: A Primer for Parents – Summer, 2024 Edition of the American Bar Association journal “Family Advocate”
The Tao of Cross-Examination: Reconceptualizing Approaches for Effective Inquiry– Spring 2022 edition of the American Bar Association journal “Family Advocate”
Why Do Family Law Attorneys Care About Law Day? – May 2022 blog article for Illinois Chapter of the AMML
Know When to Fold ‘Em: Pulling the Plug in Marriage and Divorce Matters– article in Hinsdale Living Magazine, May 2022
One Size Doesn’t Fit All: Finding the Right Lawyer When Things Go Wrong– article in Hinsdale Living Magazine, April 2022
Best Supporting Spouse in a Long-Term Marriage– article in Hinsdale Living Magazine, March 2022
The Heart of the Matter: Decoding Divorce for Modern Families– profile in Sheridan Road Magazine, December 2021
Up Close and Personal: The Challenges and Opportunities of Remote Litigation – Fall 2021 edition of the American Bar Association journal “Family Advocate”
Deconstructing The Dynamics Of Divorce, profile in Hinsdale Living Magazine, May 2021
Heads Carolina, Tails California: Relocation With Children Amid Shifting Circumstances, Chicago, Daily Law Bulletin, 2021
Prenuptial Agreement law in Illinois chapter in “Drafting Prenuptial Agreements,” 2012 and 2021 (Co-Author with Barry A. Schatz of Berger Schatz LLP)
“Discovery in Family Law Cases,” ISBA Family Law Handbook, 2011 (Co-Author with Barry A. Schatz of Berger Schatz LLP)
“A Divorce Practitioner’s Introduction to Determining Schedule C and Subchapter S Income,” Family Law Update, 2010 (Co-Author with Barry A. Schatz of Berger Schatz LLP)
“Tainted Love: What the Seventh Circuit Got Wrong in Muth v. Frank,” DePaul Law Review, 2007

Speaking and Presentations

“Maintenance Modification and Review: Preventing Future Problems” – IICLE Child Support + Maintenance 2024 (March, 2024)
“Creative Uses of Hybrid ADR Processes as Practical Adjuncts and Alternatives to Complex Mediation and Litigation” – IL-AAML Seminar for Experienced Matrimonial Lawyers (October, 2023) – Co-Presentation with Hon. Regina Scannicchio, Acting Presiding Judge of the Domestic Relations Division of the Circuit Court of Cook County
“Put that Coffee Down… – Developing, Delivering and Defending Against Compelling Opening Statements and Oral Closing Arguments” ABA Trial Practices & Techniques Committee (May, 2023)
Featured Presentation at South Carolina Bar Convention – Family Law Section — “Putting it Together – Hearings and Trials in Family Law Cases” (January, 2023)
“Putting it Together: Conducting Evidentiary Hearings and Trials in Family Law Cases” – Chicago Bar Association, 2022
“Litigation Live: An Unscripted Demonstration of Effective Psychological Expert Examinations in Relocation Trials” – IL-AAML and IICLE, President’s Day Seminar (February, 2022)
“First Impressions: Temporary Support Hearings and Establishing Lasting Narratives for Domestic Relations Cases” – IL-AAML and IICLE, 2021
“Clearing the Path: The Benefits of Meditation and Mindfulness for Attorneys” – DuPage County Bar Association, 2021
”Financial Domestic Violence” at Annual Symposium of the DePaul University College of Law Family Law Center, 2021
”Reading Demeanor in Masked Proceedings” – Our Family Wizard Panel Symposium, 2021
“Lessons Learned Through COVID-19: Utilizing Technology to Move Your Family Law Practice Forward” – IICLE, 2020
“The State of Family Law During the COVID-19 Pandemic” – Chicago Bar Association, 2020
“Family 2.0 – Coparenting After Divorce” – Family Law Symposium on the New American Family, DePaul University College of Law, 2019
“The Evolution of Dissolution – Navigating the Shifting Landscape of Divorce” – DePaul University College of Law, 2019
“Meditate Before You Litigate: Mindfulness for Lawyers” – Illinois State Bar Association Solo and Small Firm Conference, 2019
“Putting on a Financial Case in Domestic Relations” – Chicago Bar Association, 2018
“Everything You Need to Know and Do if There is an Entity or Trust in Your Case” – co-author of presentation with Sherri A. Evans and Taylor Toombs Imel (Koons Fuller, P.C.), 39th Annual Marriage Dissolution Institute, State Bar of Texas, 2016
“Insights and Tactics for Remote Litigation in Family Law,” CBA Fall 2020 (Co-Presentation)
“Tips and Warnings in Remote Evidentiary Hearings,” DuPage County Bar Association, Fall 2020 (Co-Presentation)
“How to Cross Examine a Witness,” Chicago Bar Association, Winter 2015 (Co-Presentation)
“Williams v. Illinois and Forensic Evidence,” 77th Annual Conference of the National Council of Juvenile and Family Court Judges, Summer 2014 (Co-Presentation with Barry A. Schatz of Berger Schatz LLP)
“Integrating ADR into Divorce Litigation: When and How to Use ADR Effectively,” ABA Family Law CLE Conference, April 2026, Washington, D.C.

Recognitions and Awards

Crain’s, Most Influential Minority Lawyers in Chicago, 2017
The Best Lawyers in America® for the practice of Family Law, Family Law Mediation, and Family Law Arbitration, 2019 – Present
H-Texas Magazine, Top Family Lawyers in Houston, 2016
Super Lawyers 2020 to Present
Super Lawyers Rising Stars 2012-2015
Emerging Lawyers, 2015 – 2018
Law Bulletin Publishing Company, 40 Illinois Attorneys Under Forty to Watch, 2012
Leading Lawyers 2026
Lawyer of the Year for Chicago Family Law Arbitration by Best Lawyers for 2025

Organizations and Memberships

Prior Chair, Advisory Board of DePaul University College of Law Family Law Center

Member, Advisory Council – David Lynch Foundation (Chicago)

Fellow, American Academy of Matrimonial Lawyers

Founding Member, American Academy for Certified Financial Litigators

American Bar Association – Family Law Section

Illinois State Bar Association – Family Law Section

State Bar of Texas – Family Law Section

Fellow, International Academy of Family Lawyers

DuPage County Bar Association

Other Team Members

Founding Partner

Kristen R. Serna

Kristen R. Serna is a founding partner of Hammer Serna & Quinn, LLC. She focuses her practice solely on matrimonial matters including complex divorce litigation, allocation of parenting time and parental responsibilities, and...

Senior Associate

Olivia Basu

Olivia is a Senior Associate at Hammer Serna & Quinn LLC and joined the firm in 2024. Olivia focuses exclusively on family law cases, which include divorce, custody/parenting issues (now known as allocation...

Founding Partner

Shannon K. Quinn

Chicago family lawyer Shannon K. Quinn is a founding partner of Hammer Serna & Quinn. Shannon focuses her practice exclusively on family law, including complex financial matrimonial issues and allocation of parental responsibilities...

Get In Touch

Call or email Hammer Serna & Quinn, LLC today to schedule a consultation.

Attorney Advertising. This information is designed for general information only. The information presented should not be construed to be formal legal advice nor the formation of a lawyer/client relationship. Past results and testimonials are not a guarantee, warranty, or prediction of the outcome of your case, and should not be construed as such. Past results cannot guarantee future performance. Any result in a single case is not meant to create an expectation of similar results in future matters because each case involves many different factors, therefore, results will differ on a case-by-case basis. By providing contact information, users acknowledge and give explicit consent to be contacted via the methods of communication provided, including SMS. Message and data rates may apply. Message frequency may vary. Reply STOP to opt out.