The move is part of a broader restructure of MediaCom's senior management team across the UK and EMEA, to be announced in the coming weeks.
In her new role, Blackett will work alongside Nick Lawson, the new chief executive of MediaCom EMEA. She will work on the agency's development and growth of new business in European markets.
Lawson, the former chief executive of MediaCom UK, took on his EMEA role in August and was replaced as the UK chief executive by the agency's managing director, Jane Ratcliffe.
Blackett joined the agency in 1998 as a planner from The Media Business following its merger with MediaCom.
She was promoted to the board three years later and was made the marketing director at MediaCom in 2003. Accounts she has worked on include Procter & Gamble, Nokia and GlaxoSmithKline.
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