About
Erica R. Day is a shareholder at Williams, Porter, Day & Neville, P.C., whose practice focuses on civil litigation in Wyoming. She handles motor vehicle accident cases, professional liability matters, products liability claims, premises liability disputes, and work-related injury cases. Day also has experience with medical malpractice defense, civil rights matters, and real estate-related disputes, giving her a broad foundation for representing clients in contested civil matters.
Day earned both her B.A. and J.D. from the University of Denver. After law school, she practiced in Oregon in a commercial banking and regulatory field before returning to Casper, Wyoming. Her education and early regulatory experience helped develop the analytical and problem-solving skills that support her litigation practice, particularly in cases involving complex factual records, professional standards, business issues, and questions of legal responsibility.
Day joined Williams, Porter, Day & Neville in 2013 and became a shareholder in 2017. Her practice has included civil defense matters involving medical malpractice, professional liability, motor vehicle accidents, products liability, premises liability, workplace injuries, civil rights, and real property issues. Through this work, she helps clients assess claims, prepare litigation strategies, address legal and factual disputes, and navigate matters in which financial exposure and professional or business interests may be significant.
Erica R. Day is a member of the Wyoming, Oregon, and Colorado Bar Associations and also contributes pro bono legal service through Equal Justice Wyoming. Her volunteer work reflects an interest in helping individuals who need assistance with civil legal matters. Combined with her litigation background and experience across several areas of civil defense, Day brings practical judgment and a client-focused approach to resolving disputes and addressing legal challenges.
Law Office Affiliations
- Shareholder, Williams, Porter, Day and Neville, P.C.
- Member, Wyoming State Bar Association
- Member, Oregon State Bar Association
- Member, Colorado State Bar Association
Licensed State
- Wyoming
- Oregon
- Colorado
Education
- University of Denver
Juris Doctor (JD) - University of Denver
Bachelor of Arts (BA)



- Construction Accidents
- Motorcycle Accidents
- Products Liability
- Slip & Fall Accidents
- Professional Liability




