Mullis represents the 53rd District in the Georgia Senate. He is the chairman of the Senate Rules Committee and is a member of the Appropriations, Economic Development and Tourism and Regulated Industries and Utilities committees. Mullis also chairs the Senate Music Committee and the Halls of Fame Joint Committee. He has been recognized by Georgia Trend and James Magazines as one of the Most Influential People in Georgia. Mullis and his wife, Teresa, have three children and one grandchild. They reside in Chickamauga.