His appointment follows the promotion of Ludo Ducrocq to head the company's 80-stong team of brand ambassadors worldwide.
Allanson joins Grant’s after an eight-year tenure as editor of Whisky Magazine.
Allanson said: “I’ve been a whisky commentator for years, but having the opportunity to take centre stage at the heart of such a famous production house is really exciting. This is no solo gig. I’m joining a great team; from cooper, to still man, to master blender and I look forward to working alongside them, tasting some great whisky and playing my part in the incredible and continuing Grant’s success story.”
Grant’s global brand director, Shane Hoyne said: “Grant’s story has been over 100 years in the making and Rob will be a key member of the team as we together aim to win over a new generation of whisky drinkers around the world. We’re very excited to have him on board.”