Derek S. Casey

Derek S. Casey is a seasoned attorney in Wichita with over 30 years of experience handling complex civil litigation. He has appeared before state, federal, and tribal courts nationwide, from New York to Honolulu, and is recognized for his expertise in investigating, defending, and prosecuting high-stakes matters across a broad range of practice areas.

Derek earned his Juris Doctor from the University of Oklahoma College of Law in 1991. Since then, he has dedicated his career to private practice in Wichita, focusing on civil disputes that require meticulous preparation and strong advocacy. His education and decades of practical experience allow him to navigate the most challenging legal issues with confidence and skill.

Derek’s practice areas include business and commercial litigation, employment disputes, trust and probate litigation, guardianship and conservatorship matters, construction litigation, contract disputes, and appellate law. He also has significant experience with employment discrimination, wrongful discharge claims, noncompete agreements, fiduciary duty disputes, ERISA litigation, subrogation claims, tortious interference, and complex class action or multi-district litigation.

Outside the courtroom, Derek is a recognized resource for other lawyers. He regularly writes articles on trial practice and speaks at continuing legal education (CLE) seminars, where he shares practical, real-world strategies for litigators. His work helps raise professional standards in the legal community. Derek is also active in several bar and professional organizations and gives back through long-term service with the Boy Scouts and local community programs.

Respected for his thorough preparation, versatility, and dedication to client service, Derek S. Casey provides strategic, results-driven representation. His ability to blend legal knowledge with practical problem-solving has established him as a trusted advocate for individuals, businesses, and organizations across Wichita and beyond.

Law Office Affiliations

• Attorney, Triplett Woolf Garretson, LLC
• Member, Kansas Bar Association
• Member, Oklahoma Bar Association
• Member, Wichita Bar Association
• Member, American Association for Justice

Licensed State

• Kansas
• Oklahoma

Education

• University of Oklahoma College of Law
  Juris Doctor (JD)
• University of Oklahoma
  Bachelor of Arts (BA)

Awards & Badges