She will also focus on senior talent development and support WPP's horizontality strategy by getting the best of GroupM's services to WPP clients regardless of which agency landed the client.
Pattison's new gig is the latest in a string of high-profile hires and changes at the the world's largest media buyer since a year ago, including the naming of global CEO Kelly Clark and the introduction of technology suite mPlatform.
In her time at Maxus Pattison has led a number of industry initiatives.
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Added WPP CEO Sir Martin Sorrell: "With new content companies such as Netflix and Amazon growing rapidly, the competition for premium content is heating up across the globe".
"Clients need us to think differently and work smarter", Clark said. "Pattison will help us deliver on those challenges. She's a force and holds the respect of clients and colleagues". "She will make a huge impact with her smarts, energy and warmth".
Her prior experience includes roles at Young & Rubicam, PHD and Sony Ericsson.
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Pattison was named global chief executive of Maxus in October 2014. She was previously global chief strategy officer and UK CEO for Maxus.
"When we look at the broader business context, the transformation we are experiencing is profound", Pattison said. "The WEF calls it the 'fourth industrial revolution, ' a technological revolution and one that requires two key skills to succeed: collaboration and agility".
GroupM, the world's leading media investment group, today announced the appointment of Lindsay Pattison as Chief Transformation Officer (CTO). GroupM's primary goal is to maximize the performance of WPP's media agencies by operating as leader and collaborator in trading, content creation, sports, digital, finance, and proprietary tool development. "New thinking is required across the board, and I'm delighted to take on this new transformation role".
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The WPP-owned GroupM has created Motion Content Group, which is being billed as an investment and rights management firm.