In his new position, Harris will primarily be responsible for generating new business across the group's outbound telemarketing, digital and data specialist HSM and digital creative agency Hyperlaunch.
Harris has a solid background in marketing and driving new business. His career has seen him work at agencies including Euro RSCG, Brann and Ogilvy & Mather and Lowe Direct in New York.
Ben Langdon, Digital Marketing Group's chief executive, said: "His new business and marketing skills gained from time at Brann, Lowe Direct, Euro RSCG Circle and DMS will aid the growth of both HSM and Hyperlaunch.
Digital Marketing Group, which is listed on the AIM market, recently posted annual results revealing that profits before tax were up 42% to £6.69m for the year ended March 31 2008.