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Sean P. Sullivan is a seasoned attorney with over 15 years of experience providing trusted legal counsel to individuals and families. As a Fellow of the American Academy of Matrimonial Lawyers (AAML), Sean is recognized among the nation’s leading family law practitioners for his expertise, professionalism, and commitment to excellence. He specializes in complex matrimonial and family law matters, including divorce, custody, and high-net-worth asset division, and also handles business litigation and disputes involving contested estates. Sean has been named an Illinois Super Lawyer in both 2024 and 2025, a distinction awarded to attorneys who demonstrate outstanding professional achievement and peer recognition. In addition to his legal practice, Sean serves on the Board of Directors for CASA of DuPage County, advocating for children in need within the court system, and is a member of the Illinois State Bar Association (ISBA) Child Law Section Council, contributing to policy and best practices for child welfare and family law. Sean earned his Juris Doctor from Western Michigan University Cooley Law School and received his certification in Divorce Mediation from Northwestern University, further enhancing his ability to guide clients through complex family law disputes with clarity and confidence. Outside of his professional work, Sean and his wife actively support Cystic Fibrosis research and advocacy, a cause close to their hearts as it has impacted their extended family. They also share a love for dogs and have rescued several over the years—their current rescue, Roxy, is a spoiled and quirky pit bull who keeps life entertaining. When he’s not practicing law, Sean enjoys golfing, cooking, and cheering on the Chicago Cubs.
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Chat withState: Illinois
Acquired: 2010
No misconduct found
555 Water's Edge Lane Suite 205, Suite 107, Lombard, IL, 60148
Showing 1 - 5 of 5 client reviews from Avvo
Posted by Jessica | February 20, 2023 | Hired Attorney
I didn’t know where to look for a lawyer that would have my best interest due to the situation I was in and was referred to Sean. I couldn’t have been happier with the candor, honesty, understanding and communication Sean and his team had with me. He is unbelievably knowledgeable and detailed. Highly...
Posted by Paul | January 8, 2022 | Hired Attorney
To all in need of qualified representation in a legal battle as I was. I would recommend Mr Sean Sullivan as one of the most qualified and knowledgeable attorneys that I have ever dealt with. We were in a battle for several years and Sean knew how to defend all allegations that were thrown out there....
Posted by anonymous | April 12, 2021 | Hired Attorney
Not the best time in my life, surely, but Sean made the process much more gentle than I feared it might be. He was very kind, friendly to talk with, efficient in all he did for my case, and I even learned a bit about legal writing through him. Nice and smooth on this end thanks to all of Sean and his...
Posted by Chris | November 2, 2020 | Hired Attorney
I hired Sean to help with a complicated divorce situation. Actually Sean navigated an array of stumbling blocks that were put in front of us. To me he came through both professionally with an understanding personal touch. Sean is easy going with his clients, but tough on opposing counsels. I can ...
Posted by Marybeth | September 29, 2020 | Hired Attorney
While Sean specializes in family law, he was recommended to us when our daughter, a very newly licensed driver, had to make a court appearance after a traffic altercation. When we received the attorney of the other party involved in this incident, we chose to seek legal assistance. Sean accompanied...
"Sean is an energetic and passionate advocate for his client's interests. Sean won't rest until he gets his clients the best outcome possible. Highly recommended."
"Sean and I were opponents in a divorce case. He was attentive to his client's needs, and was extremely courteous and professional. I give Sean all five stars."
"My highest endorsement to Sean. He is practical and well grounded, works to settle matters when settlement is in the client's best interest, and a fierce litigator in the courtroom."
"I had the privilege of working as an associate attorney under Sean Sullivan. He is a very thorough and detailed attorney whether he's handling your divorce, setting up your business or representing you in civil litigation. He is highly reputable and respected among peers."
Divorce and separation lawyer
Family lawyer
Divorce and separation lawyer
Divorce and separation lawyer
Divorce and separation lawyer
Divorce and separation lawyer
Family lawyer
Divorce and separation lawyer
Family lawyer
Divorce and separation lawyer
Probate lawyer
Lawsuits and disputes lawyer
Litigation lawyer
Family lawyer
Family lawyer
Family lawyer
Litigation lawyer
Divorce and separation lawyer
Child custody lawyer
Divorce and separation lawyer
2025
Super Lawyer, SuperLawyers
2025
Fellow, American Academy of Matrimonial Lawyers
2024
SuperLawyer, SuperLawyers
2022
Lawyers of Distinction, Lawyers of Distinction
2022
Top 10 Attorneys, National Academy Of Family Law Attorneys
2021
Lawyers of Distinction, Lawyers of Distinction
2021
Top 10 Family Law Attorney, National Academy of Family Law Lawyers
2021
10 Best Attorney Client Satisfaction, American Institute of Family Law Attorneys
2021
Peer Review Rated, Martindale-Hubbell
2020
Top 10 Illinois Family Law Attorney, National Academy of Family Law Attorneys
2020 - Present
Partner, SBK Law Group
2017 - 2020
Senior Associate, O'Flaherty Law Firm
2015 - 2017
Associate, Law Office of Laura Kern
2014 - 2015
Associate, Law Office of Wendy Morgan
2011 - 2014
Associate, Appelman & Assoc.
2021 - Present
ISBA Child Law Section CouncilMember
2018 - Present
DuPage Bar AssocationMember
2010 - Present
ILLINOIS STATE BAR ASSOCIATIONMember
2007 - Present
American Bar AssociationMember
2025 - 2026
DCBA Family Law SectionChair
2024 - 2025
DCBA Family Law SectionVice Chair
2022 - 2023
DCBA Professional Responsibility SectionVice Chair
I successfully negotiated a buy-out of the employee's shares, along with agreeing to waive the non-compete agreement and clarifying the terms of the non-solicitation clause.
The Court granted my motion to dismiss the new proceedings on the same matter the parties had just settled.
2021
Certificate in Divorce Mediation
2009
JD - Juris Doctor
2002
Psychology
2023
2022
2021
2011
English
Legal Answers
Legal Guides
How to do a notice of relocation?
24 Oct 2023
What are the chances of supervised visits?
02 Oct 2023
What type of relief can I ask for when filing a petition for contempt? Specifically for coparent not ensuring homework is done?
01 Sep 2023