Sean Sullivan Attorney: A Skilled Counselor in Family and Business Law


Attorney Sean P. Sullivan, with over ten years of dedicated legal practice, specializes in Family Law and Business Law. His expertise lies in handling highly contentious matters, whether they involve divorce cases or business disputes. Sean is not just a lawyer; he is a compassionate counselor who guides his clients with skill and empathy through their most challenging times. While he possesses the unwavering ability to take any case to trial, Sean acknowledges the importance of skillful negotiation in achieving optimal resolutions. He maintains open and direct communication with his clients, ensuring that they understand the issues at hand and the potential outcomes they may face. Sean believes in presenting all possible scenarios, even the toughest realities, and collaborates diligently with his clients to advocate for the best possible results.

Sean has earned recognition from both clients and peers for his fair and practical approach, his zealous advocacy, and his competence in the courtroom. Recognizing the profound impact that family law or business matters can have on his client’s lives, he dedicates his utmost care and attention to every case. Beyond his exceptional advocacy skills, Sean brings a considerable skillset to the table in negotiation and mediation, holding a certification in mediation from Northwestern University. Some of his most gratifying achievements stem from helping parties reach reasonable agreements, effectively avoiding the time and resources that protracted litigation involves.

Sean embarked on his legal journey at The Collins Law Firm, where he served as a law clerk. During this time, he had the privilege of supporting a team of attorneys at a leading boutique personal injury law firm in the Chicago area. Sean actively engaged in all aspects of high-stakes litigation, gaining invaluable experience in large-scale civil cases and class action lawsuits. Following this, Sean pursued his Juris Doctor at Western Michigan Law School, earning his degree in 2009, with a specialization in litigation.

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Throughout his law school journey, Sean excelled in mock trials, moot court, trial skills, and alternative dispute resolution classes. During his final semester, he interned with the Cook County Public Defender’s Office, where he represented clients in felony drug cases. Later, he was invited to join the prestigious Homicide Task Force, actively participating in the defense of a defendant in the Brown’s Chicken murder case, one of Cook County’s most prominent defense trials in the last three decades.

After graduating from law school and passing the bar, Sean served in the General Counsel’s Office for the Illinois Department of Financial and Professional Regulation for a year. In this role, he provided crucial assistance in policy decisions, internal administration, and enforcement of professional licensing. Sean then honed his expertise in family law by working with some of DuPage County’s most well-known attorneys before joining a general practice firm as its senior family law and litigation counsel.

Before attending Western Michigan Law School, Sean earned a Bachelor of Arts degree in Psychology with a minor in Political Science from the University of Iowa. His background in psychology often proves advantageous in devising legal strategies and approaching negotiations. Born and raised in DuPage County, Sean’s roots trace back to Naperville, where he attended Naperville North High School before returning to the area after college and law school.

When Sean isn’t immersed in legal research or trial preparations, he indulges in his passions for cooking, golfing, and enthusiastically cheering on his beloved Cubbies in their pursuit of another World Series title. Although Sean and his wife experienced the loss of their cherished rescue dog Mazie in January 2022, they found joy in adopting a quirky puppy named Roxy, who has become just as beloved and possibly even more spoiled than her older sister.

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In addition to their personal pursuits, Sean and his wife actively support the Cystic Fibrosis Foundation, passionately contributing to finding a cure for this devastating disease that profoundly affects their extended family. Moreover, Sean proudly serves on the Board of Directors for DuPage County Court Appointed Special Advocates (DuPage County CASA), witnessing firsthand the invaluable service this organization provides to children in the DuPage County legal system who have limited advocates.

Current Employment Position

Attorney at Garrity Traina