Patrick Collister, the former creative director and vice-chairman of Ogilvy & Mather, is to join the direct marketing and digital agency ehsrealtime as executive creative director.
Collister left O&M in January 2000 to launch a creative consultancy called Creative Matters.
His appointment at ehsrealtime ends its long search for a creative chief following the merger 12 months ago of Evans Hunt Scott and Real Time.
Collister joins the executive board at ehsrealtime and will work in partnership with Phil Jones, the agency's vice-chairman, in overseeing its creative resources. The agency's three creative directors, Mark Attrill, Patrick Baglee and Trevor Chambers, will report to Collister.
Collister has extensive experience of both traditional and online creative.
He won several awards as the creative director at BMP DDB and O&M, including a Cannes gold award.
He was then responsible for launching the new-media unit at O&M, now known as O&M Digital. Under his leadership it won the first Cannes Cyber Lion award for the CampaignLive website.
The arrival of Collister at ehsrealtime in April will coincide with the early retirement of Ken Scott, a founding partner of EHS, who will leave the agency in the same month but continue to work on creative projects.
Terry Hunt, chairman of ehsrealtime, said: 'Patrick is a top class creative. He will bring an approach that is relevant to all media and is a great champion of ideas, but of ideas that can be implemented.'
Collister said: 'The more I looked at ehsrealtime the more interested I became. It's the first agency to offer a genuinely integrated product. Lots of other are talking about doing it, but here's one group that is actually doing it.'
Ehsrealtime, part of Havas, has grown to be an agency with pounds 147 million billings and 300 staff. Its clients include Tesco, Microsoft, Procter & Gamble and Diesel. The appointment of Collister is something of a coup for the agency, which interviewed several leading creative directors before making the appointment.