Oliver B. Krejs

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...

Kevin Vela is a lawyer recognized by Best Lawyers in the practice areas of Corporate Law, Gaming Law and Mergers and Acquisitions Law. Kevin practices law in Dallas, Texas Best Lawyers has recognized Kevin Vela since 2026. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Kevin Vela is held by other lawyers.

Kevin S. Woltjen is a lawyer recognized by Best Lawyers in the practice area of Corporate Law. Kevin S. practices law in Dallas, Texas Best Lawyers has recognized Kevin S. Woltjen since 2027. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Kevin S. Woltjen is held by other lawyers.

Charlie Frazier’s successful argument before the Supreme Court of the United States is just one highlight in a distinguished appellate practice in both federal and state courts. For over 32 years, Charlie has assisted trial lawyers with legal strategy and handled appeals in variety of matters, including complex commercial disputes, insurance-related issues, and professional-malpractice claims. Charlie has argued many cases before the United States Court of Appeals for the Fifth Circuit ...

Al Ellis, Of Counsel, is known in legal circles for his leadership and integrity in the practice of law, as well as his service to the community. At Sommerman, McCaffity, Quesada & Geisler, L.L.P., he focuses his practice on personal injury, products liability, dram shop, medical malpractice litigation and mediation/arbitration. Al vigorously advocates for his clients, having tried more than 175 jury trials. He is Board Certified in Personal Injury and Civil Trial Law by the Texas Board o...

Mark E. Bishop is board certified in commercial real estate law by the Texas Board of Legal Specialization. His experience includes the negotiation, due diligence review, documentation, and closing of sophisticated real estate transactions, including the acquisition and disposition of office buildings, hotels, commercial tracts, ranch land, and multi-family properties. Mr. Bishop has also represented a national retailer in multi-state land acquisitions and development work; negotiated and clo...

Cheryl E. Diaz is a lawyer recognized by Best Lawyers in the practice area of Commercial Litigation. Cheryl E. practices law in Dallas, Texas Best Lawyers has recognized Cheryl E. Diaz since 2023. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Cheryl E. Diaz is held by other lawyers.

Paula Bennett represents clients in a wide range of Family Law matters, including divorce and complex property issues, but has a particular commitment to working with parents to resolve issues that impact the welfare of their children. This focus includes parental custody disputes, the termination of parental rights, custody modification, custody relocation and child support matters. Board Certified in Family Law by the Texas Board of Legal Specialization, Paula is a member of the Texas Acade...

Courtney S. York is a lawyer recognized by Best Lawyers in the practice area of Corporate Law. Courtney S. practices law in Dallas, Texas Best Lawyers has recognized Courtney S. York since 2025. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Courtney S. York is held by other lawyers.

Justin Presnal is a partner and seasoned trial and appellate lawyer with more than 30 years of experience representing plaintiffs in complex product liability, mass tort, and multi-district litigation (MDL). He brings a deep command of legal strategy, a passion for writing, and a national reputation for helping clients win high-stakes cases. Justin has served on leadership committees in some of the country’s largest MDLs, including litigation involving prescription opioids, defective hi...