Attorney Bios
Partners
David W. Carstens
As a partner in the firm, David W. Carstens brings together a highly-skilled background in patent law and engineering to develop winning strategies for clients. He is knowledgeable in all aspects of intellectual property - including patents, trademarks, copyrights, and trade secrets - and helps clients to evaluate their needs and do what is required to protect their innovations.
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Colin Cahoon
The combination of Colin Cahoon's legal expertise with a distinguished career in the armed forces enables him to provide clients with smart, technical legal counsel. As a partner in the firm, Mr. Cahoon concentrates his practice in patent law and aviation law. Mr. Cahoon brings a depth and breadth of experience to his practice that enables him to advise clients on a broad spectrum of intellectual property issues.
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Vincent J. Allen
Vincent J. Allen joined the firm in 1999 and was promoted to partner in 2005. Mr. Allen combines his diversified experiences in aviation, electrical engineering, patent prosecution, and litigation to provide clients with knowledgeable, effective, and efficient legal representation. Mr. Allen's industry expertise includes microwave communication systems, semiconductor devices, computer hardware and software, aircraft powerplant and airframe systems, avionics, and telecommunications.
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Christopher P. O'Hagan
Christopher P. O'Hagan graduated with a BS in Physics from Washington and Lee University in 1994 and earned a law degree from George Mason University School of Law in 1998. He joined Carstens & Cahoon, LLP as an associate in 2000. His practice area is patent law, with an emphasis on patent prosecution.
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Associates
Bobby W. Braxton
Bobby W. Braxton joined Carstens & Cahoon, LLP as an associate in 2007. His primary practice area is patent law. Mr. Braxton graduated from Texas A&M University in 2004 with a bachelor of science in chemical engineering.
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Jeffrey G. Degenfelder
Mr. Degenfelder is a registered patent attorney and a member of the State Bar of Texas. He is a former Marine Corps helicopter pilot with extensive flight experience. His primary practice areas are intellectual property law, aviation law and complex litigation. He is a member of the State Bar of Texas and a registered patent attorney.
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Celina M. Diaz
Celina M. Diaz joined Carstens & Cahoon, LLP as an associate in 2007. Her practice area is intellectual property, with an emphasis on patent prosecution and trademarks. She is a graduate of the University of Texas School of Law and also earned her B.S. in Chemistry and B.A. in Spanish from the University of Texas.
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James R. Gourley
James Gourley joined Carstens & Cahoon, LLP as an associate in 2005. He focuses his practice on intellectual property law, franchise law, and litigation. Mr. Gourley is a graduate of Southern Methodist University Dedman School of Law. Before attending law school, Mr. Gourley attended the University of Oklahoma where he graduated with a Bachelor of Science degree with distinction in Chemical Engineering.
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Casey L. Griffith
Casey L. Griffith concentrates his practice in the area of intellectual property litigation. Mr. Griffith is experienced in enforcing and defending against myriad intellectual property rights, including patents, trademarks, copyrights and trade secrets. He has managed for his clients virtually all phases of a lawsuit, from its filing through appeal. Mr. Griffith also has first-chair jury trial experience to his credit.
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Zachary W. Hilton
Zachary Hilton joined Carstens & Cahoon, LLP as an associate in 2006. His primary areas of practice include intellectual property law and aviation law.
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Chad Walter
Chad Walter joined Carstens & Cahoon, LLP as an associate in 2003. His primary practice area is patent law.
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Steven H. Washam
Steven H. Washam is an associate with Carstens & Cahoon, LLP. As a fully licensed patent attorney, he practices in all areas of intellectual property law.
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