Katie Mannen is a native of St. Louis, Missouri, but her connection to Jackson, Wyoming began early in life, when she and her family spent significant time in the area. That longstanding connection ultimately brought her back to Jackson, where she has built both her legal career and her family.
Katie earned her Bachelor of Arts degree in 2009 from Elon University in North Carolina and her Juris Doctor in 2012 from the University of Wyoming College of Law. While in law school, she worked with the Wyoming Coalition Against Domestic Violence and Sexual Assault, an experience that helped shape her commitment to client-centered, compassionate advocacy.
Following graduation, Katie worked with the Teton County Prosecuting Attorney’s Office for one year before transitioning into private practice in May 2014 at a local Jackson firm. In 2016, she founded Mannen Law, LLC, and she is now a partner at Mannen Browne LLC. Katie is admitted to practice in both Wyoming State and Federal Courts.
Katie’s practice focuses on:
• Family law including divorce, legal separation, child custody, child support, modification of child custody and child support, paternity actions, adoptions, guardianships, and prenuptial and postnuptial agreements
• Criminal defense including misdemeanor and felony charges
• Protection orders for domestic violence, sexual assault, and stalking
• Mediation
Katie understands that many of her clients come to her during some of the most difficult moments of their lives. She takes pride in serving not only as an advocate, but also as a trusted counselor and advisor, helping clients navigate complex legal issues with clarity, empathy, and practical guidance.
In addition to her private practice, Katie has provided legal services through the Teton County Access to Justice Center, assisting individuals who might not otherwise have access to legal representation. She has also been appointed by the court to represent individuals in involuntary hospitalization proceedings. Katie is a member and former president of the Teton County Bar Association, and she is an active member of the Wyoming State Bar and the Wyoming Trial Lawyers Association.
Katie is deeply committed to community service and philanthropy. She has long been involved with the local committee for St. Jude Children’s Research Hospital, which organizes an annual fundraising event in Jackson. She also serves as a trustee of the Berges Family Foundation in St.
Louis, which supports cultural engagement, STEM preparedness, youth empowerment, and initiatives benefiting first responders and community heroes. In addition, Katie is a founding board member of Cops for Kids JH, an organization dedicated to fostering trust, understanding, and positive relationships between law enforcement and youth in the community.
Outside of her practice, Katie enjoys life in Jackson with her husband, a Jackson native, and their two daughters. She values time spent outdoors and in the community, and in her free time enjoys traveling, cooking, entertaining, and all things equine. Their home is shared with a lively group of animals, including dogs, horses, a barn cat, and a beloved miniature cow.
Email:[email protected]
Phone:(307) 733-7424
