Sargeant will also be involved in training CH&Co academy chefs, leading culinary communications, team engagement and motivation.
Academy chefs will be given the opportunity to work and learn in the chef’s flagship Rocksalt restaurant in Folkestone.
“CH&Co is a dynamic and growing business, which makes it a very interesting prospect,” said Sargeant.
“The thing that excites me most is how many different businesses there are in the group, all with their own challenges.
“I’ve always been a fan of diversity and this will make for lots of interesting work and keep me on my toes.”
Bill Toner, CH&Co Group’s chief executive, added: “Mark is undeniably an incredibly talented chef who is enjoying a remarkable career. His experience, vision and style is a fantastic fit for the business.
“He will work well with our chefs at all levels, inspiring them to innovate and build on the excellent food they are already serving to our clients, and also to develop their careers.”
Catering and hospitality group, CH&Co, employs around 6,000 people and operates at over 700 location across the UK and Ireland.