Real Experience, Real Results
Our lead attorney at O'Neill Law Firm has nearly 30 years of experience as an aggressive litigator. His main focus is representation in family law. He has also assisted numerous people accused of criminal and drunk driving offenses, with excellent results. He enjoys helping everyday people get a fresh start in life and is a member of the American and Wisconsin Association of Justice as well as the Wisconsin and La Crosse Area Criminal Lawyers Associations.
O'Neill Law Firm was formed by attorney Sean O’Neill in 2012 to meet the growing needs of his clients. With nearly 30 years of aggressive practice, our lead attorney has a solid track record. Following his example, we work hard to prove to our clients that we are attorneys they can trust with the future of their finances or family.
Your Priority, Our Commitment: Choose A La Crosse Legal Team That Truly Cares
Over the years, Sean O’Neill has developed a specific focus in two major areas of practice – Family Law and Criminal Law. Focusing on these areas puts him in the courtroom a lot, a place where he feels very comfortable. Sean enjoys the mental and intellectual challenge of litigating, which involves performing under pressure and considerable intellectual focus. His goal is always to provide strong, smart representation for individuals facing divorce and other family law matters. When the pressure is on, clients deserve an experienced, aggressive, and bold advocate to reach their goals. He also understands that many of my clients are new to litigation. He takes my role as a counselor and advisor seriously. Sean fully understands that his clients may experience fear and trepidation. He advises clients based on his experience and knowledge of the law so that they can fully and accurately assess their options before engaging in the high-stakes environments of court hearings and settlement negotiations.
Sean regularly appears before the court in La Crosse County and four other surrounding counties in the Coulee Region. With his experience in the courtrooms around the area for the last 28 years, there is not much he has not seen. That translates into intimate knowledge of all the courts in the area and vigorous representation of his clients, often achieving excellent results in the most difficult of circumstances.
On a personal note, Sean lives in Onalaska and enjoys spending time with his family and children. He is the proud father of two adult children and one teenager. Community involvement and giving back is also important to Sean. He is a member of the State Bar of WI, member of the Family Law Division and a current board member of that division. He is also a member La Crosse County Bar Association and has served 25 years as a member, president, and zone chair of Onalaska Lions Club. We enrich our community through servant leadership and our many community projects, one of which is a “All Abilities” Children’s Park in Onalaska. Sean is currently the president of the Onalaska Lions Club.
Education
- Drake University Law School, Des Moines, Iowa J.D. – 1997 Honors: High Honors Honors: Order of Coif (top 10% of his class)
- University of Wisconsin La Crosse B.S. – 1993 Major: Political Science and Public Administration
- River Valley High School, Spring Green, WI 1988
Professional Associations
- American Association Justice, Member
- Wisconsin Association Justice, Member
- Wisconsin Criminal Lawyers Association, Member
- La Crosse Area Criminal Lawyers Association, Member
- Wisconsin State Bar Family Law Section, Board of Directors
Classes & Seminars
- U.W. La Crosse and Western Wisconsin Technical College on issues of Constitutional Law, Criminal Law and Contracts, Lecture Real Experience
The O'Neill Law Firm Team
Sean has assembled a team of experienced paralegals to help you navigate your legal issues. As the first contact for new and existing clients, our paralegals ensure that our clients’ experience goes as smoothly and efficiently as possible. Our paralegals take their decades of experience in law firms and the court system and translate that into providing exceptional service for our clients.
What Will It Cost?
Let’s be honest: the biggest issue in deciding to hire a lawyer is usually cost. “How much will this cost me?” is a frequent question. You work hard to earn money for yourself and your family, and the last thing you want to do is pay a lawyer who will constantly have his handout for more money. The attorney gets paid, but your case is no longer to a conclusion. You keep bleeding money.O'Neill Law Firm is different. We don’t bill or collect fees like the traditional law firm. We will not nickel-and-dime you to death. We embrace a billing model that consists of many options to fit your budget. Our firm is built on open communication and client satisfaction. If there are any questions about the billing process, clients are encouraged to talk directly with Sean. It’s an open-door policy. We feel that good communication is the key to a successful attorney-client relationship.
What Level of Service Can I Expect?
O'Neill Law Firm’s motto is “Have Us in Your Corner.” We know you want professional service and results, not excuses. You want someone available to answer your questions in a professional and competent manner. O'Neill Law Firm prides itself on keeping you informed about your case every step of the way. We are there when you need us. We are on your side and will fight to get you the best result possible with your legal issue. If the result you want isn’t possible, Sean will use his knowledge and experience to make sure you understand why and what your options are.
How Is O'Neill Law Firm Different?
We openly acknowledge the obvious – you could choose any lawyer in the area to help you.
Why choose O'Neill Law Firm?
Because you want someone that you can trust in your corner, fighting for you. We use the best method of advertising – word of mouth. You can’t buy that. When a client recommends us to a friend, family member, or posts online about how we fought for them – that’s the difference between O'Neill Law Firm and everyone else. Read our testimonials and case results. When your case is finished, we want 100% satisfaction. If you’re not satisfied, we want to know why and how we can improve. We’re always striving to be better.
Work With Our Firm Today
At O'Neill Law Firm, you will receive aggressive litigation that puts your best interests forward. Whether it’s a family law dispute or you need someone to defend you in criminal case, our firm will be there to fight for you every step of the way.
To receive help from an attorney, call us today at 608-519-4816 or use our online contact form. Let’s find a solution to your problem today.

