Abrahams, a former journalist at the Financial Times, said he would leave in May for a director of European communications role at ‘an institution in the City'. He declined to comment further.
Waggener Edstrom president EMEA Claire Lematta said the company had no plan to replace Abrahams.
Abrahams joined Waggener Edstrom in 2003 as a director in its San Francisco office, and moved to his UK MD role in 2004.
Before that Abrahams worked as a tech and pharmaceutical correspondent for the FT, and headed the paper's Tokyo and San Francisco bureaux.