Richard Collins, director of brands marketing at Britvic, is leaving the company next week.
Collins joined the soft drinks manufacturer in 2002 and has worked on a variety of major initiatives for the company over the last four years.
He was expected to spearhead an extended push for Britvic's Gatorade, the still sports drink, in the UK later this year in a bid to wrestle more market share from Coca-Cola's Powerade brand.
A spokesman for Britvic confirmed Collins' departure, but was unable to say where he was moving to or give details of who would be replacing him. Collins joined Britvic from the US, where he spent seven years as the global marketing director for rum, spirits and wines group Seagram.
He held various other roles within the company including category brand manager for whiskey in the United States.
Prior to his time at Seagram, he was also brand manager for Batchelors instant soups at Unilever.