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Sean Patrick Sullivan

Divorce and separation Attorney at Lombard, IL

5.0   5 reviews
Virtual consultation available
Virtual consultation available
  • Licensed for 13 years
    State IL
    Acquired 2010
    Active and Authorized to Practice Law No misconduct found

We have not found any instances of professional misconduct for this lawyer.

About Sean

Learn Sean’s areas of practice.

Attorney Sean P. Sullivan has been practicing law  for over ten (10) years. Sean excels at providing high quality legal services, primarily focusing in the areas of Family Law and Business Law.

Sean began his legal career by joining The Collins Law Firm as a law clerk where he had the privilege of supporting a team of attorneys specializing in toxic tort litigation at a preeminent Chicago-area boutique personal injury law firm. While there, Sean participated in all aspects of high stakes litigation and gained invaluable experience in large scale civil cases and class action lawsuits. After several years learning all that he could, Sean went on to attend Western Michigan Law School where he obtained his Juris Doctor in 2009, with a certificate in litigation.

While in law school, Sean excelled in mock trial and moot court, and also in his trial skills and alternative dispute resolution classes. During his last semester of law school, Sean completed an internship with the Cook County Public Defender’s Office, representing clients in felony drug cases. During this time, he was asked to join the prestigious Homicide Task Force, representing defendants facing the death penalty. While there, he participated in the representation of a defendant in the Brown’s Chicken murder case, one of Cook County’s largest and most highly publicized defense trials in the last 30 years. After graduating law school, and passing the bar, Sean spent a year working in the General Counsel’s Office for the Illinois Department of Financial and Professional Regulation assisting in policy decisions, internal administration, and enforcement of professional licensing. Sean then had the opportunity to work for some of DuPage County’s best-known names in family law before joining a DuPage County general practice firm as its senior family law and litigation counsel.

Sean specializes in highly contested matters, be it divorce cases or business disputes. Sean is a true attorney and counselor at law. Clients rely on him to skillfully navigate them through the challenging decisions they must face at some of the most difficult times in their lives. Sean is a skilled and zealous courtroom advocate, more than capable of taking any matter to trial. However, he also understands that sometimes the best resolutions are achieved through skillful negotiation. Sean’s approach with his clients is both honest and direct at all phases of their legal matter. He ensures his clients clearly understand the issues before them and the various outcomes they may face. Sean firmly believes in making sure his clients understand all possible outcomes, including potential worst-case scenarios and hard truths, and then works diligently with his clients on their behalf to advocate for their best possible outcome.

Sean has a well-earned reputation with his clients and among the legal community for being fair and practical, but never afraid to fight if he must! He understands the significance a family law or business matter can have on nearly every aspect of his client’s life, which is why he gives every client matter his utmost care and attention.

Prior to going to Western Michigan Law School, Sean attended the University of Iowa earning a Bachelor of Arts degree in Psychology with a minor in Political Science. Sean often finds his psychology degree useful in his legal strategy and approach to negotiations. A lifelong resident of DuPage County, Sean grew up in Naperville, attending Naperville North High School, and returning to the area after both college and law school.

When not doing legal research or preparing for trial, Sean spends his free time cooking, golfing, and along with his wife and their beloved and highly spoiled rescue dog Mazie, rooting for his beloved Cubbies to win another World Series title! To embrace their philanthropic side, Sean and his wife are also active in supporting the Cystic Fibrosis Foundation, helping raise money to find a cure for this terrible disease that personally impacts their extended family.

Contact Sean

Sean P. Sullivan
555 Water's Edge Lane Suite 205
Suite 107
Lombard, IL, 60148


5.0 / 5.0
  5 customer reviews
5 Star
4 Star
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1 Star
Posted by Jessica | February 20, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Grade A Lawyer
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 recommend!!
Posted by Paul | January 8, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Paul A. Paul Jr. President. Paul Design Builders,Inc
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. He is a true warrior for his clients and I would tell anyone who would ask if I was satisfied with his representation I would say without a doubt. He is the man. Paul A Paul Jr. Satisfied client 100%
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Posted by anonymous | April 12, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Very kind, efficient
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 colleagues' work. Many thanks.
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Posted by Chris | November 2, 2020
This review is from a person who hired this attorney.
| Hired Attorney
Dr. Chris Johnson
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 attest to that. He is very knowledgeable on the law and guided a novice such as me through the divorce court system and process. In short I am grateful for his counsel and the result of my case.
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Posted by Marybeth | September 29, 2020
This review is from a person who hired this attorney.
| Hired Attorney
Sean Sullivan - Attorney Review
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 us to court and walk us through what to expect. Sean reminded our daughter of how to conduct herself in court and how to proceed during the process. We are very grateful to Sean Sullivan for his expertise and support. Our daughter's case was dismissed! Thank you, Sean, for helping this new driver (and her parents) through a very tense time.
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Contact for Details


AVVO RATING 10.0 (Superb)

Work Experience

  • Partner
  • SBK Law Group
  • 2020 - Present
  • Senior Associate
  • O'Flaherty Law Firm
  • 2017 - 2020
  • Associate
  • Law Office of Laura Kern
  • 2015 - 2017
  • Associate
  • Law Office of Wendy Morgan
  • 2014 - 2015
  • Associate
  • Appelman & Assoc.
  • 2011 - 2014
View all work experience


  • Northwestern University
  • Certificate in Divorce Mediation
  • 2021
  • Western Michigan Law School
  • JD - Juris Doctor
  • 2009
  • University of Iowa
  • Psychology
  • 2002

Legal Cases

  • Jones v. Smith
  • 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.
  • Jones v. Smith
  • The Court granted my motion to dismiss the new proceedings on the same matter the parties had just settled.


  • DCBA Professional Responsibility Section
  • Chair
  • 2023 - Present
  • ISBA Child Law Section Council
  • Member
  • 2021 - Present
  • DuPage Bar Assocation
  • Member
  • 2018 - Present
  • Member
  • 2010 - Present
  • American Bar Association
  • Member
  • 2007 - Present
  • DCBA Professional Responsibility Section
  • Vice Chair
  • 2022 - 2023
View all associations

Languages Spoken

  • English

Honors and Awards

  • Lawyers of Distinction
  • Lawyers of Distinction
  • 2022
  • Top 10 Attorneys
  • National Academy Of Family Law Attorneys
  • 2022
  • 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
  • 2021
  • Top 10 Illinois Family Law Attorney
  • National Academy of Family Law Attorneys
  • 2020
View all awards


  • GPSolo
  • Finding Employment in Tough Times
  • 2011
View all publications

Attorney endorsements

Received (5)
Given (20)
Endorse Sean
Divorce and separation Attorney | Mar 01
Relationship: Fellow lawyer in community
"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."
Divorce and separation Attorney | Oct 30
Relationship: Opposing Counsel on matter
"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."
Family Attorney | Sep 18
Relationship: Co-worker
"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."
Family Attorney | Aug 28
Relationship: Worked together on matter
"I endorse this lawyer. Easy to get along with and very professional and knowledgeable."
Family Attorney | Aug 28
Relationship: Worked for lawyer
"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
Divorce and separation
Divorce and separation
Divorce and separation
Divorce and separation
Divorce and separation
Divorce and separation
Lawsuits and disputes
Divorce and separation
Child custody
Divorce and separation