Josh Krichefski and Tim Irwin are handed key roles.
GroupM CEO talks to Campaign about merger and restructure.
EssenceMediacom will launch with 10,000 employees in 125 offices, handling close to $25 billion in billings.
Former Aegis Media president Susannah Outfin takes over from Nilufar Fowler.
Dentsu and Performics will cover Lenovo's APAC markets, while Stagwell's Assembly has won the business in EMEA and the Americas.
Publicis picked up a majority of the global business with WPP missing out.
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