Butler, Pierce, 1866-1939, Associate Justice of the U.S. Supreme Court (1923-39), b. Dakota co., Minn. Admitted (1888) to the bar, he practiced in St. Paul, specialized in railroad law, and became an expert in railroad-valuation cases, serving (1913-22) both the U.S. and Canadian governments. On the Supreme Court, to which he was appointed by President Harding, he was generally considered a conservative.