Mark Linehan is to step down from his role as managing director of the Sustainable Restaurant Association (SRA) after five years.
The not-for-profit membership organisation has begun its search for a new leader.
In his time at the helm, the SRA has grown from 50 to almost 6,000 member sites across the UK, as well as extend its reach into sectors including contract, university and school catering.
Giles Gibbons, chair and founder of the SRA, said: "When Mark took up the reins at the SRA in 2010, we had only just launched, had 30 members, and a bag full of ideas."
"Five years on, and Mark has not only overseen a hundredfold increase in the number of our member sites and ensured that our Food Made Good rating is regarded as the industry gold standard, but he has also helped put sustainability on the menu for all foodservice businesses. We are immensely grateful for all his endeavours and wish him well in his next project".
Linehan also supervised the launch of the SRA's consumer brand, Food Made Good, in 2015.
He said: "After more than five years as managing director of the SRA, I have decided now is the right time (for both me and the organisation) to move on to pastures new.
"I am immensely proud of what we have achieved at the SRA in that time, bringing the issues we care about into sharper focus, making sustainability something that no restaurant or foodservice operator can ignore and creating a movement of like-minded people who want to do business in the right way. And now, as the SRA enters its next phase of development with Food Made Good at the heart of what it does, I believe it is in great shape for my successor."