The catering boss will lead the group in supporting schools, colleges, employers and other agencies in delivery of the Diploma, which is launched this September.
Harrison commented: "The catering industry serves a broad spectrum of customers who, due to the rapid growth in interest in food and cooking, have never been more discerning.
"Therefore, a highly trained workforce is key to maximising our potential in this area and, most critically, encouraging the next generation to consider catering as a career.
"The Diploma in Hospitality provides an excellent, dynamic learning vehicle for young people, as well as opening their eyes to the wealth of career opportunities that are available to them in hospitality. My aim is for Diploma students to see hospitality as their career of choice."
The Diploma combines theory with practical learning for 14 to 19 year-olds, to ensure that learners gain the skills, knowledge, and experience that hospitality businesses really need.
Harrison takes over the role from Mike Stapleton, former UK corporate affairs director at Compass UK.
Heather Taylor, Hospitality Diploma manager for People 1st, said: "I am delighted that Geoffrey has agreed to chair the Diploma steering group. He brings with him a wealth of knowledge and industry experience and is committed to ensuring that the vision and intent of the Diploma is followed through to the learners' experience.
"I would also like to thank Mike Stapleton for his continued commitment and support of the qualification from its very early days. The Diploma is a great example of joint cooperation and commitment between industry and education, and Mike's input has been extremely valuable throughout the process."
By Janie Stamford
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