GroupM’s chief investment officer Seb Rennie resigns

The chief investment officer at WPP’s media agency group GroupM, Seb Rennie, has resigned from the agency after more than two years in the role.

Rennie, Australia’s top media trading executive, is looking to “pursue something different” GroupM’s CEO, Mark Lollback told Mumbrella this morning.

Lollback said Rennie has a long notice period with the media investment group, which purchases media on behalf of WPP’s agencies, and is welcome to stay as long as he wishes while the company does its “due diligence” in its search for a replacement.

Rennie joined WPP’s media agency group in 2015 to replace the former head of investment Danny Bass, who moved to IPG Mediabrands to be its CEO.

Rennie had worked within WPP for 10 years

Prior to his stint as the chief investment officer at GroupM, Rennie was the chief investment officer at MEC, another part of the WPP group, for almost seven years.

Claire Butterworth then replaced Rennie as the head of investment at MEC when he took on the role at GroupM.

Rennie has also spent time at other media agencies including MediaCom and OMD.

Earlier in the year, GroupM reduced its media agency portfolio to three by merging Maxus and MEC into a the Wavemaker business.


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