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Mary Beth Callan

Since 1981, Mary Beth Callan has been representing insurance companies and self-insured businesses in the defense of worker’s compensation claims.  Mary Beth also represents employees in cases involving worker’s compensation issues.   Prior to joining Menn Law Firm, Ltd. Mary Beth was a member of the Denissen, Kranzush, Mahoney & Ewald, S.C. law firm for 33 years.

Admitted to Practice

State of Wisconsin
U.S. District Courts for Eastern and Western Districts of Wisconsin

Professional Association Memberships

State Bar of Wisconsin
Brown County Bar Association
American Bar Association
Wisconsin Association of Worker’s Compensation Attorneys


Mary Beth has spoken at numerous seminars on the practice of worker’s compensation law in the State of Wisconsin.
Since 1994, Mary Beth has received an AV peer review rating from the Martindale-Hubbell Law Directory, which is the highest rating for ethics and legal ability.
Mary Beth has been selected to be included in the publication The Best Lawyers in America and has been recognized by the publication Wisconsin Super Lawyers as a Super Lawyer in the area of Worker’s Compensation.


University of Wisconsin-Oshkosh, B.S. 1976
Marquette University, J.D. 1980


My purpose is to provide timely, creative and effective legal representation to my clients who are primarily located in the Green Bay–Fox Valley area.  It is my goal to create an amicable resolution to the legal issues facing my clients.