John A. Haase

Dean P. Laing has been with O'Neil, Cannon, Hollman, DeJong & Laing S.C., a 40-plus attorney law firm headquartered in Milwaukee, Wisconsin, for over 40 years since graduating cum laude from Marquette University Law School in 1983. He was on the firm’s Board of Directors from 1990 to 2023, and was the firm's President from 2015 to 2020. Mr. Laing has repeatedly been recognized by members of the bar as one of Wisconsin’s top trial attorneys. Throughout his legal career, in whic...

David J. B. Froiland is a top attorney recognized by Best Lawyers in the practice area(s) of Employment Law - Management, Labor Law - Management and Litigation - Labor and Employment. David J. B., who practices law in Milwaukee, Wisconsin, has been recognized since 2018. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which David J. B. is held by other top lawyers in the same geographic and legal practice area.

William H. Tobin is a top attorney recognized by Best Lawyers in the practice area(s) of Employee Benefits (ERISA) Law. William H., who practices law in Milwaukee, Wisconsin, has been recognized since 2016. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which William H. is held by other top lawyers in the same geographic and legal practice area.

Dave Roettgers is a Shareholder focusing his practice on the purchase and sale of businesses, taxation, corporate finance and business law. He is a Certified Public Accountant and uses his prior experience at Arthur Andersen LLP where he provided tax planning and business advice for individual and business clients. Representative Matters and Experience Representation of families and owners in all types of business planning including the transition of the business to the next generation, finan...

Aaron H. Aizenberg is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation. Aaron H., who practices law in Milwaukee, Wisconsin, has been recognized since 2020. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Aaron H. is held by other top lawyers in the same geographic and legal practice area.

Mark P. Tilkens is a top attorney recognized by Best Lawyers in the practice area(s) of Employment Law - Management, Labor Law - Management and Litigation - Labor and Employment. Mark P., who practices law in Madison, Wisconsin, has been recognized since 2013. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Mark P. is held by other top lawyers in the same geographic and legal practice area.

My practice emphasizes personal injury, medical and legal malpractice, bad faith insurance claims and business litigation. I have extensive litigation experience in the State and Federal Courts of Wisconsin and have practiced in many courts outside Wisconsin. Prior to becoming an attorney, I was a pharmacist for five years. I love to golf. I'm practicing as much as I can because someday, you never know, I might be playing on the senior tour. My wife and I have three grown children and two you...

Grant Killoran is a shareholder at O’Neil Cannon and the Past Chair of its Litigation Practice Group. He has significant and diverse trial experience representing clients in Wisconsin State and Federal Courts, and courts around the country, focusing on complex business, health care and employment law disputes. Grant also devotes a portion of his practice to arts and entertainment law, with an emphasis on the music industry. Grant is listed in The Best Lawyers in America® in the prac...

Jennifer R. D'Amato is a top attorney recognized by Best Lawyers in the practice area(s) of Business Organizations (including LLCs and Partnerships), Closely Held Companies and Family Businesses Law, Litigation - Trusts and Estates, Tax Law and Trusts and Estates. Jennifer R., who practices law in Milwaukee, Wisconsin, has been recognized since 2007. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Jennifer R. is held by other top lawyers in t...

When the Indiana steel mill department shutdown in 1984 where I had worked for nearly 8 years as a steelworker, including a stint as union representative, my family and I moved to Milwaukee. I started law school and after graduating in 1987, I served as a law clerk to the Hon. John L. Coffey, circuit judge for the U.S. Court of Appeals for the Seventh Circuit. My time as a lawyer has now spanned 30 years, and my practice is primarily dedicated to representing and fighting for justice for inju...