Riley joins the company from Yoplait where he was grocery sales controller.
Paul Elliott, who has been acting sales director for the past five months, will move into the position of commercial director.
Both men will report to general manager, Drew Munro who said: "“We are delighted to have Mark and Paul on board. Mark brings with him a wealth of relevant sales experience in the spirits business.
“We would also like to thank Paul for all his hard work and welcome him to the business in his role as commercial director.”