Grant A. Walsh

Steven Hartsell is a registered patent attorney and focuses his practice on patent infringement litigation, patent licensing, and inter partes review proceedings. He has represented clients in federal courts across the country in cases involving a variety of technologies, including semiconductors, distributed agent architectures, cellular phones, telecommunications, software anti-piracy, medical devices, DVD and television controls, and optical systems. Steven also has extensive experience re...

James Voelker is a top attorney recognized by Best Lawyers in the practice area(s) of Banking and Finance Law. James, who practices law in Dallas, Texas, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which James is held by other top lawyers in the same geographic and legal practice area.

Erin Nealy Cox, the former United States Attorney for the Northern District of Texas, is a trial lawyer who represents corporations, boards of directors, and executives involved in complex multi-jurisdictional disputes and high-stakes investigations. As a partner in the Firm’s Dallas and Washington, D.C., offices, she is a member of the Firm’s Government, Regulatory & Internal Investigations Practice Group. Erin has a broad practice focused on matters arising from alleged viol...

Christine Demana is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation. Christine, who practices law in Dallas, Texas, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Christine is held by other top lawyers in the same geographic and legal practice area.

Alan Rucker is a top attorney recognized by Best Lawyers in the practice area(s) of Product Liability Litigation - Defendants. Alan, who practices law in Dallas, Texas, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Alan is held by other top lawyers in the same geographic and legal practice area.

In complex business, technology, and intellectual property matters involving parties and interests around the country and beyond, John DeGroote has served as a mediator and arbitrator in significant disputes since 2013. His experience as a litigator, corporate counsel and business executive brings rare and valuable perspective to dispute resolution. Mr. DeGroote previously served as chief litigation counsel to KPMG Consulting, LLC/BearingPoint, Inc., a $3 billion global consulting firm with a...

Christina Tate is a top attorney recognized by Best Lawyers in the practice area(s) of Leveraged Buyouts and Private Equity Law. Christina, who practices law in Dallas, Texas, has been recognized since 2022. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Christina is held by other top lawyers in the same geographic and legal practice area.

Gordon Russell, a founding Director of the Firm, is a member of the Financial Services Practice Group and of the Business and Corporate Transactional Practice Group. Gordon has concentrated his practice on banking and financial institutions, business and corporate, real estate and resolution of distressed assets. He has extensive experience in commercial lending, real estate development and finance, and business transactions. Gordon also maintains a regular general business practice, includin...

Andrew B. Derman is a Partner and head of International Energy Practice Group for Thompson & Knight LLP and Chairman of Thompson & Knight Global Energy Services. He represents public and private companies and host governments in their strategic design, commercial execution, negotiations, contract preparation, and legal interpretation. Recent experience includes: acquisition and divestment efforts in North America, South America, Europe, Africa, Asia, and Australia; international finan...

Mr. Biermacher, a director of the Firm, is the most senior member of the Litigation Section in the Dallas office. His general broad trial and appellate practice and experience representing clients on both sides of the docket not only encompass personal and bodily injury defense provided on behalf of insureds and self-insured entities arising out of catastrophic injury, wrongful death, toxic and mass tort, sick building, false arrest, rape, defamation and professional negligence claims, but al...