Derek A. Walker

Maureen Brennan Gershanik is a partner in Fishman Haygood’s Business Section. She practices primarily in the areas of corporate law and governance, securities law, and mergers and acquisitions. She also advises clients on ESG initiatives. Maureen has an active business transactional and advisory practice. She works with clients on public and private offerings of debt and equity securities, acquisition transactions, restructuring transactions, business separations, new business formation...

Mark Fullmer practices in the areas of business and finance and corporate and securities. He represents start-up companies as well as companies in the mature stages of their growth cycle. His practice in the area of corporate and securities includes all aspects of public and private company representation, including public offerings, private placements, corporate governance, compliance with Sarbanes-Oxley, and mergers and acquisitions. He has also represented both venture capital funds and in...

Mr. Masinter's practice focuses on contentious, complex litigation while concentrating primarily in the areas of business litigation, and securities litigation and arbitration. He also handles cases involving corporate disputes, breach of contract claims and unfair trade practices. Mr. Masinter is Chair of the firm's Litigation Section and Co-Chair of the Securities Practice Group. He joined Stone Pigman in 1990.

As a degreed engineer, Keith J. Bergeron realizes that it gives his construction clients a sense of security to know they share similar backgrounds and that he understands their type of work. Receiving a lawsuit brought against you brings the stigma that something went wrong, but sometimes that is not a true statement. Keith investigates claims and defends his clients in all aspects of construction and construction surety law. He devotes special attention to architectural and engineering defe...

Shaun P. McFall’s practice focuses on complex litigation matters. His experience includes antitrust actions, bankruptcy litigation, class actions, complex commercial disputes, products liability, securities litigation and toxic tort matters. Additionally, Shaun has experience representing financial institutions during investigations by regulatory authorities including the SEC and FINRA. Most recently, Shaun participated in a multiweek jury trial in defense of a medical device manufactur...

Dirk Wegmann is a partner in the Litigation Practice Group. He focuses on commercial civil litigation. Drawing on his more than 30 years of litigation experience, Dirk provides effective representation to clients in federal courts, state courts, and arbitration. He has substantial experience providing counsel regarding disputes and litigation in the areas of insurance coverage, tax, breach of contract, injunctions, fraud, unfair competition, landlord/tenant, construction, trusts and estates, ...

Michael F. Held is a top attorney recognized by Best Lawyers in the practice area(s) of Admiralty and Maritime Law. Michael F., who practices law in New Orleans, Louisiana, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Michael F. is held by other top lawyers in the same geographic and legal practice area.

Daria Burgess Diaz is a top attorney recognized by Best Lawyers in the practice area(s) of Environmental Law and Litigation - Environmental. Daria Burgess, who practices law in New Orleans, Louisiana, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Daria Burgess is held by other top lawyers in the same geographic and legal practice area.

Nathan P. Horner is a top attorney recognized by Best Lawyers in the practice area(s) of Admiralty and Maritime Law. Nathan P., who practices law in New Orleans, Louisiana, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Nathan P. is held by other top lawyers in the same geographic and legal practice area.

Terry Knister has more than 30 years of litigation experience in both bench and jury trials and also on appeal. His practice is concentrated on toxic tort and environmental litigation with an emphasis on class action and mass tort cases. He has served as lead trial counsel in numerous cases involving allegations of personal injury, property devaluation/damage, and remediation as a result of chemical exposure and/or contamination. These matters typically include thousands of plaintiffs seeking...