Howlett will take on the new role of executive vice-president of the company's Global Consulting Practice. His replacement as the chairman of OgilvyOne Worldwide UK is Paul O'Donnell.
O'Donnell was previously the executive vice-president, international development director for the worldwide network. He joined O&M Direct in 1985 as a data services consultant and in his 17 years with the company he has been the president of OgilvyOne Asia-Pacific, overseen the expansion of the network into Latin America and been heavily involved with the company's Amex business worldwide.
Reimer Thedens, the chairman and chief executive of OgilvyOne Worldwide, said: "At OgilvyOne it is our philosophy to provide new challenges for every member of our team, enabling us to keep talent and experience within the network, while injecting fresh thinking to constantly challenge and re-invent our business.
"Nigel and Paul, who have been with Ogilvy for 11 and 17 years respectively, and are both founder members of the OgilvyOne board, are being provided with the opportunity to extend their skills and experience in their new positions."
Howlett's new position will see him return to a consulting-led role: he was the managing director of O&M's Dataconsult before he landed the chairman's job at OgilvyOne.
Before Ogilvy, Howlett worked as the client services director for the WWAV subsidy The Computing Group. In his new capacity, Howlett will also be required to oversee OgilvyOne's global partnerships and alliances.
OgilvyOne has endured mixed fortunes in recent times. Last year's £20m BT Retail account win failed to compensate for the £30m loss of TV Licensing and the further loss of its Double Click and Handbag.com accounts.
This year it has added Dove, DHL and the GUS-owned Choice catalogue to its client list, all fellow Ogilvy group clients.
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