About
Patrick J. Lewallen is a Wyoming lawyer and partner at Chapman Valdez & Lansing Attorneys At Law, whose practice covers a broad range of civil, criminal, family, and business matters. His work includes personal injury law, professional negligence, premises liability, product liability, family law, criminal defense, and business transactions. He has developed experience representing clients across several types of disputes and transactional matters since beginning his legal career in 2015.
Patrick earned his B.S. in Mathematics from the University of Wyoming. He later received his J.D. from the University of Wyoming College of Law. During law school, he participated in the Defender Aid Clinic and gained practical experience in state and federal courts. His work included matters before the Wyoming Supreme Court, US District Court for the District of Wyoming, US Court of Appeals for the Tenth Circuit, and US Supreme Court.
Patrick gained additional legal and research experience while working with the Wyoming County Commissioners Association in 2015. During that time, he published the first edition of Wyoming’s Public Lands Handbook. He entered private practice later that year and expanded his work across litigation and transactional matters. His mathematical background, legal training, and experience with public lands research contribute to a practice involving complex factual and legal issues.
Patrick J. Lewallen maintains a varied practice serving clients with personal injury, negligence, liability, family, criminal, and business concerns. He is active in the local community and regularly volunteers with Big Brothers Big Sisters. His professional background includes courtroom experience, legal research, publication work, and representation involving a range of civil and criminal matters. He continues to build his practice around litigation, advocacy, and business-related legal services.
Law Office Affiliations
- Attorney, Chapman Valdez & Lansing, Attorneys, and Counselors at Law
- Member, Wyoming State Bar
Licensed State
- Wyoming
Education
- University of Wyoming College of Law
Juris Doctor (JD) - University of Wyoming
Bachelor of Science (BS)

- Business Litigation
- Homicide
- Sex Crimes
- White Collar Crime
- Domestic Violence
- Products Liability
- Slip & Fall Accidents




