People on the move featuring Merkle, Reebok, VML and more

This week has seen another wave of appointments and departures at brands, media owners and agencies. The Drum has rounded up the key moves from the EMEA, APAC and North America regions below. 
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Merkle
Merkle has announced the appointment of Stefan van der Wielen as leader of its EMEA Decisioning Practice. Van der Wielen joins from Pegasystems, where he was regional delivery director.
WCRS
Grant Parker has been appointed creative director and head of art at