Stewart-Hunter's appointment ends OMD Europe's search for the final piece in its senior management line-up. It has been incomplete since MindShare's Sheila Byfield, in an eleventh-hour change of heart, decided against taking the job in October last year.
Stewart-Hunter said: "I've been keen to get back into the media agency fold for some time and an opportunity like the one at OMD Europe comes along very rarely."
She has previously worked as the senior planning director at Davidson Pearce and was the head of planning at Lowe. Stewart-Hunter became the vice-chairman of Lowe in 1993, leaving five years later to join Peter York's SRU business strategy consultancy. She joins OMD Europe after Easter.
OMD Europe's chief executive, Colin Gottlieb, said that as its network was the last to form, he was given the opportunity to create a structure that is different to its competitors.
"We are the only media network that has category champions. They are free to operate anywhere in the network and are both the creators and evangelists of the OMD proposition, as well as the guardians of its delivery,
Gottlieb said.
Denekamp has been at OMD since 2000, having joined from The Media Edge where he was the chief financial officer. He also worked as the European group chief operating officer at CIA. No-one at OMD Europe would comment on his departure.
The network has recently restructured its US operations consolidating the media capabilities of Omnicom's three agency networks, BBDO Worldwide, DDB Worldwide and TBWA Worldwide, into OMD USA.
OMD's worldwide president, Joe Uva, said: "Outside the US, this integrated model already exists. Now the US model will mirror that, maximising media accountability and integrated marketing communications solutions."
- Leader, p24.