Sir Martin Sorrell's also hired former Ogilvy CEO Miles Young as a non-executive director.
The S4 Capital chief remains bullish about a Q4 recovery.
Vuurmans, who previously held the title of global executive creative director, said that now was the time for MediaMonks to have its first global CCO because of its ever-increasing scale.
Like-for like revenue rose 41% in what Martin Sorrell called an "outstandingly successful" first full financial year.
Sorrell is merging Circus with S4's global content practice, which is built around MediaMonks.
Former WPP chief was angry that ex-colleague called S4 Capital 'speck in rear-view mirror'.
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