Moore was employed as creative director at Mischief PR for three years, and worked at Cake between 2005 and 2013, prior to its merger with Havas Sport & Entertainment, where it became Havas SE Cake.
Moore produced some of Cake's most famous work during his eight years at the agency, including the Sainsbury’s Never Mind The Pollacks campaign and Ikea Sleepover.
The new role will see Moore responsible for leading creative output across all of the agency’s clients, which include Virgin Atlantic, Sony Mobile, Coca-Cola, Barclays, Carling and Very.co.uk.
Havas SE Cake is currently focused on strengthening its creative offering, and has recently promoted Lizzy Pollott to the role of associate creative director, meanwhile Nicola Rutledge, managing partner, entertainment partnerships, as well as Jodie Butt, head of PR, have similarly returned to the agency in recent months.
Adrian Pettett, chief executive of Havas SE Cake, said: "Simon was a huge part in establishing Cake’s creative heritage. A fearless commitment to driving innovation and out of the box creativity which is the bedrock of everything this agency stands for.
"Simon returning as the creative chief of our newly merged and enlarged operation with Havas Sports is incredibly exciting for us, for him and most importantly for our clients."
Moore added: "It’s a very exciting time to be at Havas SE Cake. I first chatted about The Entertainment Hub with Adrian over the summer and was very interested in what I heard.
"Building stronger partnerships between brands and entertainment has always sat at the heart of what Cake had previously done. The Hub takes that concept to the next level. I think we both felt that the successful work they have been doing, would be enhanced by my return both conceptually and aesthetically."
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