He served in the Colorado General Assembly from 2009 – 2014 as the Representative from House District 15, which encompasses portions of Northeastern Colorado Springs. Mark served as the House Minority Leader for the 2013 legislative session and the Assistant House Majority Leader for the 2011 and 2012 legislative sessions. Commissioner Waller was sworn into office in July 2016 to fill a vacancy created by Commissioner Amy Lathen’s departure and was then elected to a four-year term in November 2016.