Wheaton joins from EHS Brann where she worked for 10 years, most recently as executive planning director.
At TMW, Wheaton will be responsible for the agency's new strategic offer of account planning, data planning, data analytics and the newly formed marketing effectiveness function in one department. She will oversee a team of 12 planners and 18 staff members in total, working across the portfolio of TMW clients, which include Diageo, Unilever, Nissan and Sainsbury's.
The appointment is part of a restructure within TMW's strategy and planning department. It includes a merger with the data and marketing effectiveness offering, "Intelligent Influence", to create one department, in a bid to create greater brand engagement.
Wheaton will report to TMW managing director Chris Freeland, who said: "We spent a long time searching for the right person to lead our strategic services so this is a long awaited and exciting appointment.
"Kate's experience in developing strategies that engage with consumers and influence behaviour makes her the ideal person to head up our strategic offering in line with our Intelligent Influence proposition."
Richard Marshall, TMW partner, said: "Linking the strategy, planning with the data and marketing effectiveness departments to gain customer insight and totally aligning it with creative is a great move forward."