Crozier moved to
Leavenworth, Kansas, on March 7, 1857, where he established the
Leavenworth Daily Times newspaper and continued to practice law. He became a
Republican when the party was founded in the mid-1850s, and he served on the Kansas territorial council from 1857 to 1858. In 1861, and Crozier was appointed
United States attorney for the district of Kansas by President
Abraham Lincoln. He served until 1864, when he resigned. From 1864 to 1867, Crozier served as
Chief Justice of the
Kansas Supreme Court. After leaving the bench, he resumed practicing law and also served as cashier and manager of the First National Bank of Leavenworth. ==Later career==