Stacy is originally from Craig, Colo., where her family has a sheep and cattle ranch. After graduating from Dartmouth College and working on litigation policy issues in Washington, D.C., Stacy attended graduate school at Stanford University, where she earned her law degree as well as her M.S. in land use and agriculture. When Stacy and her husband, Ben Guillon (who also works with ranchers and other landowners as a conservation investment advisor), moved back to Denver, Stacy began her legal career as a clerk for the Honorable Chief Judge Tymkovich of the United States Court of Appeals for the Tenth Circuit.
She then joined the law firm Lewis Roca Rothgerber Christie, where her practice focuses primarily on agricultural clients. For the farmers, ranchers, and other agricultural professionals she represents, Stacy engages in a wide range of litigation, including probate, land use, federal grazing, and commercial disputes. Stacy is also involved in several agricultural nonprofits, including as a board member of the Colorado Cattlemen’s Agricultural Land Trust and the Colorado FFA Foundation. She also serves as a member of the Corporate Council for Inclusion and Diversity for the College of Agricultural Sciences at Colorado State University.