Hamer will lead the strategic direction of the agency and will be in charge of Volvo and Barclays, the agency's most high-profile accounts.
Previously, Hamer was joint managing partner at EHS Brann London, where she oversaw the Masterfoods and MBNA accounts. She also managed The Economist and National Savings & Investments direct campaigns.
Hamer will sit on the Circencester agency board with group chief executive Andrew Harris, agency chief executive Matt Atkinson, creative director Frazer Howard and finance director Sue Vizor.
Atkinson said Hamer has brought "a wealth of ability and energy" to her role at EHS Brann London and will be instrumental in leading the Circencester team to the next level.
EHS Brann Circencester's "Young families" direct marketing push for Volvo won ±±¾©Èü³µpk10's Best Automative ±±¾©Èü³µpk10 while its "Teach yourself Volvo" picked up a Smart award for best DM pack earlier this year.
If you have an opinion on this or any other issue raised on Brand Republic, join the debate in the .