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Meet Our Legal Team

Experienced and Strategic

Our Team: Our Team

Spencer R. Prosen


Spencer is originally from Nashville Tennessee and received his Bachelor’s of Science degree in Legal Studies from the American Military University. Spencer served with the Oregon Army National Guard for nine years. His time in the military included a deployment to Afghanistan, participation in the State Partnership Program with Vietnam, and disaster management coordination.

Before law school, Spencer worked full time for the Oregon Military Department for two years coordinating military response efforts to fight wildfires and other state emergencies. Spencer attended Willamette University College of Law and graduated first in his class.

During law school Spencer received several awards and gained years of practical criminal defense experience in the public and private sector as a law clerk and worked as a judicial extern for the United States District Court for the District of Oregon.

Outside of work, Spencer enjoys the beautiful outdoors of Spearfish and serves as a volunteer with the Spearfish Fire Department


Kenzie Wagner

Legal Assistant

Kenzie's passion for the legal field, combined with her commitment to excellence, makes her an exceptional legal assistant and the most respected member of Schlimgen Law Firm.

Hailing from the admirable town of Sturgis, she pursued her higher education at the University of South Dakota.  After completing her studies, Kenzie embarked on an exciting journey to Reno, Nevada, where she honed her legal expertise at a prominent law and lobbying firm. During her time there, she gained valuable experience in various aspects of legal work, further enriching her understanding of the field. Kenzie and her husband, Blake, have called Spearfish home since 2020.  

Outside of work she is a proud dog mom and is always ready to win a game of Jeopardy.


Doris Mandura

Office Manager

Doris brings a diverse background and a wealth of experience to her role. Born in Bosnia & Herzegovina, she spent her formative years in Southern Idaho, where she cultivated a strong work ethic and a deep appreciation for the value of community. In 2015, Doris relocated to South Dakota and quickly made it her home.

Before joining the law firm, Doris enjoyed a successful career as a mortgage lender. Her passion for helping others and her desire for a new challenge led her to partner with Eric in opening their own law firm in Spearfish.

As the Office Manager, Doris seamlessly handles the administrative responsibilities that keep the firm running smoothly. She plays a vital role in ensuring the firm's success and maintaining its reputation as a trusted legal resource in Spearfish. Outside of work, Doris leads an active lifestyle. She finds excitement in mountain biking, enjoys taking on various house projects, and loves being part of her dog’s playful antics.

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