February 2023, Colorado Governor Jared Polis appointed Judge Shamis to the 5th Judicial District Court. The retirement of the Honorable Mark D. Thompson created the vacancy. The Honorable Jonathan Shamis has also served as the Lake County Judge. He chairs the Mental Health Subcommittee of the Supreme Court Committee on Judicial Education.
Judge Shamis serves on the Bridges Mental Health Program Statewide Steering Committee, the Colorado State Mental Health Diversion Program Funding Allocation Committee, the Colorado Collaborative Justice Courts Training and Educational Subcommittee.
He heads the Rural and County Track planning committee for the Annual State Judicial Conference. Judge Shamis is a Commissioner on the Colorado Suicide Prevention Commission and serves on the Governor’s Long-Term Competency Task Force.