The firm, which was founded in 2008 and forms part of industry giant WPP, has a string of blue-chip clients to its name including BT, L’Oréal and Associated British Foods.
With a team of five supporting Dunn, Maxus Scotland promises to offer an “innovative, data-driven and technology grounded approach to media planning and buying”.
Nick Baughan, chief executive of Maxus UK, said: “Edinburgh is the ideal location for Maxus to expand into, it’s a vibrant city with a staunchly international outlook.
“Scotland has its own distinct consumer and separate media market, so having local specialists on the ground will allow us to not only support the current Maxus client base but also grow our client list here.”
He added: “Andrew is a proven leader with demonstrable experience of establishing and running a world class media agency. I know he’s hungry to shake up the Scottish media scene.”
Dunn helped launch Mediacom Dublin in 2008 and was the practice’s managing director.