Mills is expected to leave his post this Friday. Commercial director Neil Jones will replace him as acting managing director until a permanent replacement is found.
Mills took over from Mark Craze as managing director in 1999 when Craze was promoted to chief executive of the Aegis-owned group.
Prior to joining the main agency in 1998, Mills was media director for Carat-owned Eurospace from 1994. He also held positions at Hoare Wilkins, BMP Business and TMD, where he began his career as a media trainee in 1986 before it was taken over by Carat three years later.
*Nigel Sharrocks, chief executive of Aegis Media UK & Ireland, said:
"Colin has done a great job particularly over the past 6 years as managing director and while his enormous energy and commitment will be missed, he leaves behind an outstanding management team and a business in great shape".
Mills added: "I feel it's time to move on to an exciting new challenge. My immediate intention is to take a short sabbatical whilst I consider my options both inside and outside the advertising business."*
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