Nick Brien will become the agency's chief executive of the Americas and U.S. business, while his predecessor earns a promotion.
MediaCom has won the estimated €875m (£773m) global media account for PSA Group, the maker of Peugeot and Citroen.
The deadline for entries to the Media Week Awards 2017 has been extended to 6 July.
Sainsbury's is poised to award its £115m media account to PHD in a stunning U-turn, four months after rival agency M/SIX won the business.
No-one in global media agencies is feeling comfortable and every company needs to think about transforming itself, the bosses of MEC and Maxus have said in a joint interview.
Cannes Lions is to launch an advisory committee "to help shape the future of the festival" in response to criticism that the festival has got too big and lost its creative heart.
WPP chief executive Sir Martin Sorrell and his Omnicom counterpart, John Wren, have talked about how the ad industry should rethink Cannes Lions or even push for its relocation to another city.
Shares in Ascential, the owner of Cannes Lions, fell more than 3% after Publicis Groupe said it would not enter the awards next year and WPP said "the jury is out" on its future participation.
Matt Bush is to take sole charge of Google's agency ad sales operation in the UK.
Cannes Lions "is anything but a party" and is one of the busiest, most efficient weeks of the year, according to Michael Kassan, the chairman of MediaLink.
The move to use fewer agencies does not mean a decline in media spend, its top marketer tells Gideon Spanier.
Haymarket Media Group has bought the British Media Awards and the Digital Media Strategies conference portfolio from Briefing Media.
News Corp has made a complaint about Google to the European Commission after the Wall Street Journal saw a plunge in referrals by the search engine's news service.
Oath has named Stuart Flint as head of European sales and Nigel Clarkson to run UK sales at the combined AOL-Yahoo business.
Media agencies are facing the biggest structural shift since their discipline separated from creative agencies, Sir Martin Sorrell has said.
The strong youth turnout should be a wake-up call for news brands, especially those with an inflated sense of their own influence after Brexit.
Advertisers will be able to use Sky's AdSmart to target Virgin Media's TV viewers after the rival platforms agreed a long-anticipated deal.
Dentsu Aegis Network has warned of "caution" among advertisers as it downgraded its growth forecast for the global ad market to 3.8% this year.
Media agencies have gone on the counter-attack in the transparency debate, demanding advertisers and auditors address potential "conflicts of interest" over media auditing.
The Media Week Awards are the biggest and most highly prized awards in UK commercial media because they are judged by the toughest critics - the industry's leaders.