Mark A. Thieszen
Mark A. Thieszen -  law office in  Butte, MT

Mark A. Thieszen

Mark was born and raised in Fort Collins, Colorado. He moved to Montana to attend Montana State University in Bozeman. He returned to Colorado to attend the University of Colorado School of Law in Boulder, Colorado. After graduating from the University of Colorado School of Law in 2008, he clerked for Justice Jim Rice at the Montana Supreme Court. Following his clerkship, he was employed as a deputy county attorney for the Butte-Silver Bow County Attorney’s Office, prosecuting all levels of crime, from investigation through trial. In 2013, he joined the law firm of Poore, Roth & Robinson, P.C. as an associate, using his trial and appellate experience in his litigation practice. He also serves on the board of a local non-profit organization.
In 2009, he was admitted to practice law in the state courts of Montana and Colorado. In 2013, he was admitted to practice in the federal district courts in the State of Montana. He is currently on ”inactive” status in Colorado.

Practice Areas

Mark’s practice areas include civil litigation with an emphasis in tort defense, medical malpractice defense, road access litigation, landlord/tenant litigation and dram shop law.


Mark graduated from Montana State University in 2005 with a Bachelor of Science degree in Business Management with Honors. He received a Juris Doctorate from the University of Colorado School of Law in 2008.