Brearley has been brought on board as associate director to spur the division's European growth.
She will work across the agency's healthcare practice clients including key accounts with GlaxoSmithKline and GE Healthcare.
'I will be translating Waggener's digital USP into the healthcare arena and educating clients about what we can offer,' said Brearley.
Brearley joins the agency following four years as senior account director at rival healthcare PR shop Red Door, where she worked on accounts including Roche. She also spent three years at Sante Communications as account director. Before working in PR, she gained a PhD in biomedical science.
She reports to Waggener Edstrom director and vice-president of healthcare EMEA Roseann Ward.
'We are aiming to build on our first year as a London-based healthcare practice,' said Ward.