Diarmaid has a Bachelor of Science (Honours) in Industrial Microbiology and a Masters of Business Administration. He began his career as a microbiologist and brewer at Dublin Brewing Co.
In Australia he has brewed at Five Islands Brewing Co. and Malt Shovel Brewery. He has had roles at a number of FMCG food businesses (CUB, Asahi Premium Beverages and Nestle) in manufacturing, production management and quality.
In 2013 he became quality manager for Pinnacle Drinks and in January 2018 he took a role as quality and sustainability manager for Endeavour Drinks Group.