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Advertising

Mike Walsh, the former chairman of the Ogilvy UK Group, has joined mobile marketing specialists Velti as its vice-president of business development. Walsh has more than 30 years' experience of working in the advertising industry. He began his career at Young & Rubicam. (±±¾©Èü³µpk10)

Media Square's non-executive chairman Roger Parry is to step down from his role in July. Parry, who only became a non-executive director last month, will be replaced after the company's annual general meeting in July. (±±¾©Èü³µpk10)

Digital

Publicis Modem Worldwide has appointed Jean-Philippe Maheu as its worldwide chief executive officer. He replaces Martin Reidy, who left in September. Maheu joins from Ogilvy & Mather, where he has been chief digital officer for North America since 2007. (±±¾©Èü³µpk10)

VivaKi, the media arm of Publicis Groupe, has appointed Marco Bertozzi as the managing director of its VivaKi Nerve Center for EMEA. He replaces Fred Joseph, who has been promoted to the new role of global chief digital officer for the Publicis network ZenithOptimedia. (±±¾©Èü³µpk10)

Marketing

Diageo's former global brands director of malts and Scotch heritage, Charles Allen, has joined Walkers as marketing director of the snack brand's sharing portfolio. He will be responsible for the Sensations and Doritos brands, reporting to Greg Lyons. ()

Media

Paul Shearring, the UK chief executive of Kinetic, is stepping down from the WPP out-of-home agency. He will not be immediately replaced. However, managing director, James Copley, has been promoted to the new role of chief operating officer for the UK. (±±¾©Èü³µpk10)

James Grant Group, the talent company that represents Ant and Dec and Piers Morgan, has appointed Michael Grade, former executive chairman of ITV, to the position of non-executive chairman. ()

YouGov's chief executive and co-founder Nadhim Zahawi is preparing to step down from his role, after being selected as a prospective parliamentary candidate for the Conservative Party. ()