Rory O'Sullivan

John M. Van Lieshout is a top attorney recognized by Best Lawyers in the practice area(s) of Environmental Law and Litigation - Environmental. John M., who practices law in Milwaukee, Wisconsin, has been recognized since 2003. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which John M. is held by other top lawyers in the same geographic and legal practice area.

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

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...

Josh Kopp is a Shareholder in the Madison office of von Briesen & Roper, s.c. Josh’s approach to the practice of law is that of a “primary care attorney.” Just as a primary care physician is skilled in care for substantially all of a patient’s medical and health care needs, Josh’s experience in representing businesses and individuals in a broad and comprehensive spectrum of transactional and litigation matters equips him to deal with most all legal matters a ...

Ashley is a shareholder focusing on civil defense litigation, handling matters at all stages - from pre-suit stage investigations and negotiations, through discovery, settlement, trial, and appeal. She has successfully defended individuals, professionals, corporations, employers, and insurers in matters involving allegations of personal injury, premises liability, product liability, and insurance coverage. Ashley is committed to providing service that produces successful results and her clien...

John (Jack) Goller is a Shareholder in the Litigation and Risk Management Practice Group at von Briesen & Roper, s.c. For more than 20 years, his practice has focused on complex civil litigation with an emphasis on mass toxic torts, product liability, transportation and catastrophic loss defense of corporations and their insurers. He serves his clients as national, regional and local counsel and takes an active role in all phases of litigation from fact and expert discovery until resoluti...

Andrew Christman is a Shareholder in the Litigation and Risk Management Practice Group at von Briesen & Roper, s.c. He has extensive litigation experience involving matters in numerous state and federal courts across the country. He focuses his practice on toxic tort, product liability, premises liability, and insurance litigation. Andrew also has experience in construction litigation, professional liability, and appellate litigation. Andrew helps clients develop, maintain and implement d...

Caitlyn B. Sikorski is a shareholder in Reinhart’s Trusts and Estates Practice where she focuses on trustee compliance and litigation, including breach of trust, breach of fiduciary duty, undue influence, and significant construction and reformation matters. She represents individual and corporate fiduciaries, beneficiaries, and other parties involved in will, trust and intra-family related disputes and matters. Caitlyn is also experienced in prenuptial and marital property agreements, ...

Mark A. Johnson is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - ERISA and Litigation - Labor and Employment. Mark A., 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 Mark A. is held by other top lawyers in the same geographic and legal practice area.

Matthew P. Dregne is a top attorney recognized by Best Lawyers in the practice area(s) of Land Use and Zoning Law and Municipal Law. Matthew P., who practices law in Madison, Wisconsin, has been recognized since 2007. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Matthew P. is held by other top lawyers in the same geographic and legal practice area.