David J. Sisson

David J. Sisson

Reinhart Boerner Van Deuren S.C.

Recognized since 2021

Milwaukee, Wisconsin

Practice Areas

Labor Law - Management

Litigation - Labor and Employment

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David J. Sisson is a shareholder in the firm’s Litigation and Labor and Employment Practices. David solves problems that arise when critical personal business relationships end. These include disputes involving departing key employees and shareholders in closely held corporations and others who owe fiduciary duties. Controversies often develop at the conclusion of these relationships regarding what may be owned by, or owed to, the respective parties. A departing employee may try to establish a competing businesses capitalizing on relationships with customers, vendors and co-workers, as well as valuable intellectual property.

Special issues arise when separations involve business partners, particularly when the business is family-owned and supports multiple generations of interested and involved family members. That expertise in sensitive and complex family issues extends to representing fiduciaries and beneficiaries in contested trust and estate matters and fiduciary litigation. Whenever possible, David helps clients develop creative theories to avoid litigation and achieve amicable separations even after threats and provocative actions have occurred, including all forms of alternative dispute resolution.

David is an experienced trial lawyer who has successfully prosecuted and defended clients in numerous trials before juries in federal and state courts, and before state agencies and arbitrators. David has also acted as Special Public Service Prosecutor for the Milwaukee County District Attorney’s Office. David regularly lectures employers, trade associations and attorneys on employment and litigation matters.

David earned his J.D. from the University of Michigan Law School and his B.A., with honors, from the University of Wisconsin-Madison.


  • 1000 North Water Street, Suite 1700
    Milwaukee, WI 53202

Reinhart Boerner Van Deuren S.C.
Headquarters: Milwaukee, Wisconsin

101 The Best Lawyers in America® awards

19 Best Lawyers: Ones to Watch in America awards

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Recognized in The Best Lawyers in America® 2022 for work in:

  • Labor Law - Management
  • Litigation - Labor and Employment

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