Mark Udall, American educator and politician
Mark Emery Udall ( YOO-doll; born July 18, 1950) is an American politician who served as a United States Senator from Colorado from 2009 to 2015. A member of the Democratic Party, he previously served in the United States House of Representatives, representing Colorado's 2nd congressional district. Prior to being elected to Congress, he represented parts of Boulder, Colorado in the Colorado House of Representatives.

Throughout his career he has proposed legislation to support renewable energy, expand national parks and protect natural resources. Born in Tucson, Arizona, he is the son of former U.S. Representative Mo Udall and the nephew of former U.S. Representative Stewart Udall. A member of the Udall family, a western American political family, his relatives include New Mexico's Tom Udall and Utah's Mike Lee. Udall ran for reelection in 2014 to a second term in the U.S. Senate, but was narrowly defeated by Republican challenger Cory Gardner.