David Callis is a 1982 graduate of the University of Tennessee at Chattanooga, with a degree in business administration. He began his career at the Tennessee Valley Authority in Chattanooga as an accountant, later becoming supervisor of power revenue. A Nashville native, he relocated back to Middle Tennessee in 1992 to join Tri-County EMC in Lafayette first as director of finance and administration and then as general manager. In February 2001, he joined the Tennessee Electric Cooperative Association as director of government and public affairs. In June 2010, he was named vice president of statewide services with oversight over government relations, communications and marketing and member relations for the association. He became general manager in January 2012.