Mark C. Wiedner

Tom represents clients in patent and trademark prosecution, intellectual property litigation, and post-grant patent challenges before the Patent Trial and Appeal Board (PTAB). Tom has a broad base of experience in various technological and business areas, particularly in pharmaceutical, biotechnology, chemical and medical device inventions. He drafts invalidity opinions, investigates freedom to operate, counsels on strategic portfolio management, and conducts due diligence investigations prio...

Craig Thorstenson concentrates his practice in the litigation of employment disputes and providing related counseling. Craig Thorstenson concentrates his practice in the litigation of employment disputes and providing related counseling. His experience includes defending numerous WARN Act, FLSA and Title VII class actions, prosecuting and defending actions over restrictive covenants, and handling complex labor arbitrations. He regularly acts as "in-house" employment counsel for several compan...

Bobbi J. Bierhals has built her practice by developing creative and customized solutions for her clients. Her experience centers on tax and business planning for high-net-worth individuals and families. Her clients range from executives and first-generation entrepreneurs to multi-generational families, with net worth from $40 million to many billions of dollars, and include a number of individuals listed in the Forbes 400. Bobbi’s breadth of experience across a wide range of client prof...

Melissa A. Siebert is a top attorney recognized by Best Lawyers in the practice area(s) of Mass Tort Litigation / Class Actions - Defendants. Melissa A., who practices law in Chicago, Illinois, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Melissa A. is held by other top lawyers in the same geographic and legal practice area.

Ben Whiting is a top attorney recognized by Best Lawyers in the practice area(s) of Mass Tort Litigation / Class Actions - Plaintiffs. Ben, who practices law in Chicago, Illinois, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Ben is held by other top lawyers in the same geographic and legal practice area.

David A. Herpe is a partner in the law firm of McDermott Will & Emery LLP, based in the Firm’s Chicago office. As a member of the Private Client Group, he counsels families, business owners, executives and individuals on all aspects of sophisticated estate and wealth transfer planning and related matters, including the preparation, administration and construction of wills and trusts, fiduciary income taxation, federal estate, gift and generation-skipping taxes, charitable gift planning, f...

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

Ricardo E. Ugarte is a top attorney recognized by Best Lawyers in the practice area(s) of International Arbitration - Commercial and International Arbitration - Governmental. Ricardo E., who practices law in Chicago, Illinois, has been recognized since 2012. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Ricardo E. is held by other top lawyers in the same geographic and legal practice area.

Matthew Antinossi's practice includes all ERISA-related areas, and he has extensive experience with the employee benefits aspects of mergers, acquisitions and divestitures, including ESOP transactions. In addition to his transactional practice, Matthew is frequently involved in representing debtors in the employee benefits aspects of bankruptcy, insolvency and restructuring. Such representations frequently involve resolution of complex ERISA Title IV issues. A significant portion of Matthew's...

Howard P. Zweig is a top attorney recognized by Best Lawyers in the practice area(s) of Real Estate Law. Howard P., who practices law in Chicago, Illinois, has been recognized since 2010. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Howard P. is held by other top lawyers in the same geographic and legal practice area.