D'Silva completed his contract on 31 January and decided to move on
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The group is urging shareholders to demand greater transparency on fossil fuel-related risks, before approving the merger.
Former creative partner at the agency Polina Zabrodskaya alleges 'harassment and discrimination' after raising concerns about campaigns.
Incumbent WPP first won the business in 2021, and formed a bespoke unit called WPP Open X dedicated to the beverage brand client.
The deal could give WPP, which owns a 40% stake in the research company, a new source of cash after the ad giant suffered a $55 million profit drop in its latest earnings.
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