AdForum Worldwide Summit: A surprise visit from John Wren, Omnicom CEO

by Johanna McDowell (@jomcdowell) NEW YORK CITY: Day 5 was quite spectacular as our first meeting was a surprise — John Wren, CEO of Omnicom. The AdForum Worldwide Summit Forum has not seen him for a few years but he accepted the invitation to join and give us an update on the Publicis Omnicom merger.

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