Stanners said: "While I will retain my day-to-day involvement with the creative department in London, I will be spending more time looking after all aspects of the St Luke's business. It is a really exciting time for us as we move into new areas of creativity, and develop the St Luke's network."
Young, who will take charge of ten creative teams and will oversee the agency's five creative directors, was part of St Luke's original start-up team in 1995.
He will continue to be partnered by Julian Vizard, the art director who rejoined the agency last November.
Young's first move as executive creative director has been to hire Roderick Fenske from HHCL & Partners as a senior copywriter, and the team Guy Manwaring and Tim Collins from Leith London. He said: "Our recent clutch of new- business wins, including Emirates and ANP, meant I had to hire some new, heavyweight talent."