Wyatt, who will report to Andy Nairn, planning director at Miles Calcraft Briginshaw Duffy (MCBD), will work across many of the accounts that former joint planning director Giles Hedger headed up prior to his recent switch to Leo Burnett as group chief strategy officer.
In his previous role, Wyatt worked across the accounts for the Department of Transport, Cow&Gate, McDonald's and Heinz.
Prior to Leo Burnett, where he spent seven years, Wyatt was at Ogilvy & Mather for five years.
Nairn said: "Matt has all the qualities that you look for in a planner -- he has a measured analytical approach but with a big belief that all is possible. He has amassed a serious amount of experience across social issues and food brands -- both of which we are heavily represented in."
Wyatt said: "After seven years, it is the right time for me to move and MCBD had huge appeal with its independent entrepreneurial feel and strong planning culture.
"It is on something of a roll right now, and I was really excited by their ambition and creative energy."