Daniel M. "Dan" Hess

Pat Bergin is a registered Patent Attorney with the United States Patent and Trademark Office. He is the chair of the Information Technology, Data Privacy and Security Section at von Briesen & Roper, s.c. and regularly assists clients with a broad range of intellectual property issues with an emphasis on domestic and international intellectual property procurement, including: drafting and prosecuting utility and design patent applications in the mechanical, electro-mechanical and medical ...

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 esta...

Jason leads O’Neil Cannon’s Corporate Practice Group. He advises and represents individuals, businesses, and banks on a variety of corporate, banking, and business-related issues, including mergers and acquisitions, commercial loan transactions, corporate issues, contract negotiation and preparation, and business entity selection and formation. Jason Assists Clients With Mergers and acquisitions Complex commercial loan transactions for lenders and borrowers Corporate matters, incl...

As a shareholder in the Milwaukee office of Ogletree Deakins, I represent employers before federal and state courts, arbitrators and administrative agencies throughout the country in nearly all areas of employment law, with particular focus in the following: • Union relations • Wage and Hour • Noncompetes and other Restrictive Covenants • Employee Benefits Litigation • Employment Discrimination I pride myself on providing thoughtful analysis and practical application ...

Michael J. Gentry is a top attorney recognized by Best Lawyers in the practice area(s) of Employment Law - Management and Litigation - Labor and Employment. Michael J., 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 Michael J. is held by other top lawyers in the same geographic and legal practice area.

Jeff Mark is a Shareholder in the Health and Business Sections at von Briesen & Roper, s.c. Jeff has extensive experience advising hospitals, multi-institutional health care systems, physician groups and specialty providers regarding a variety of transactional health care related matters including affiliations, joint ventures, acquisitions and divestitures; fraud and abuse; Stark; physician agreements; and equipment and office space leasing arrangements. In addition, Jeff represents clien...

Kristin Langhoff is a top attorney recognized by Best Lawyers in the practice area(s) of Construction Law, Land Use and Zoning Law and Real Estate Law. Kristin, 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 Kristin is held by other top lawyers in the same geographic and legal practice area.

Background Mr. Prachthauser was born in Milwaukee, Wisconsin, on January 7, 1951. Prior to joining the firm, he was House Counsel for Employers Insurance of Wausau. He is married to Joan Marie, and they reside in Hartland, Wisconsin. He has two daughters, Emily and Tracy. Lectures Mr. Prachthauser is a frequent presenter and speaker for the State Bar of Wisconsin, American Board of Trial Advocates, and Wisconsin Academy of Trial Lawyers. He has been a Civil Trial Practice Instructor at the Un...

Jesse R. Dill 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. Jesse R., 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 Jesse R. is held by other top lawyers in the same geographic and legal practice area.

David G. Peterson is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation. David G., who practices law in Waukesha, Wisconsin, has been recognized since 2014. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which David G. is held by other top lawyers in the same geographic and legal practice area.