Jeff Cook

Jeff Cook is a veteran trial attorney and founding partner at Sullivan & Cook in Dallas, Texas. Practicing law since 1984, Jeff has built a reputation for delivering effective representation across a wide range of litigation matters. He is board-certified in civil trial law, a distinction he earned in 1989 at the age of 29 after trying numerous jury cases early in his career. With over 90% of his practice devoted to litigation, Jeff provides aggressive and skilled advocacy in both state and federal courts.

Jeff Cook earned his J.D. from Southern Methodist University School of Law in 1984. He represents clients in complex family law, business, and real estate disputes, personal injury claims, probate and guardianship litigation, nursing home abuse cases, employment law, labor disputes, and professional association matters. He is also well-known for his work in equine law, a reflection of his personal passion for horses.

Jeff blends strategic, results-driven litigation with highly personalized client service. As co-founder of Sullivan & Cook, he has led the firm’s growth while staying actively involved in complex, high-stakes trials. With experience on both the plaintiff and defense sides, Jeff brings a balanced, industry-spanning perspective that helps clients achieve stronger outcomes in court and in settlement negotiations.

Jeff Cook has been board-certified in civil trial law since 1989. He is a lifelong member of the National Rifle Association and a life member of the Rocky Mountain Elk Foundation. With extensive experience and a commitment to excellence, Jeff remains a trusted advocate in civil litigation throughout Texas.

Law Office Affiliations

• Partner, Sullivan & Cook, LLC
• Member, State Bar of Texas
• Life Member, Rocky Mountain Elk Foundation
• Lifelong Member, The National Rifle Association

Licensed State

• Texas

Education

• Southern Methodist University School of Law
  Juris Doctor (JD)

Awards & Badges