Jason M. Prekop

John E. Mossberg is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - ERISA. John E., who practices law in Milwaukee, Wisconsin, has been recognized since 2010. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which John E. is held by other top lawyers in the same geographic and legal practice area.

John H. Wink is a top attorney recognized by Best Lawyers in the practice area(s) of Banking and Finance Law. John H., who practices law in Milwaukee, Wisconsin, has been recognized since 2013. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which John H. is held by other top lawyers in the same geographic and legal practice area.

Leila Sahar is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation. Leila, who practices law in Milwaukee, Wisconsin, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Leila is held by other top lawyers in the same geographic and legal practice area.

Jon Levine has a national practice focusing on representing employers in all areas of labor-management relations, including litigation before the National Labor Relations Board and in state and federal courts. He also has significant experience with: The National Labor Relations Act Union organizing campaigns Collective bargaining Labor arbitration Title VII The Americans with Disabilities Act The Age Discrimination in Employment Act The Wisconsin Fair Employment Act Jon’s notable succe...

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...

Brian T. Fahl is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation and Criminal Defense: White-Collar. Brian T., who practices law in Milwaukee, Wisconsin, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Brian T. is held by other top lawyers in the same geographic and legal practice area.

Mark Kapocius is a school attorney with more than twenty years of experience working in administrative leadership roles for school districts in Wisconsin. As a Shareholder in the Government Law Group and School Law Section at von Briesen & Roper, s.c., Mark focuses his practice on school law and advising other public-sector entities on labor and employment matters, governance issues, collective bargaining, public records and open meetings compliance. Mark has extensive experience assistin...

Colleen E. Fielkow is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation. Colleen E., who practices law in Milwaukee, Wisconsin, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Colleen E. is held by other top lawyers in the same geographic and legal practice area.

Joseph A. Kromholz is one of the founding shareholders of Ryan Kromholz & Manion, S.C., located in Brookfield, Wisconsin. The firm, which traces its roots back to 1873, was formed in 1998 and practices in all areas of intellectual property law including related litigation. Mr. Kromholz is registered to practice before the United States Patent and Trademark Office and admitted to practice in the United States District Court for the Eastern and Western Districts of Wisconsin and before seve...

James Barton is the founding shareholder of Barton Legal S.C. Mr. Barton was formerly a partner at Hansen Reynolds LLC—a premier litigation boutique with offices in three states. Prior to his time at Hansen Reynolds, Mr. Barton was an associate in the litigation practice group at Michael Best & Friedrich LLP, one of Wisconsin’s oldest and largest law firms. Mr. Barton concentrates his practice on aggressively litigating complex commercial disputes venued in state and federal c...