Heffron, who will leave GSK at the end of April, is to take a one-month break before stepping into the associate director role at The Workhouse in June.
Heffron joined GSK two years ago from Novartis.
Prior to Novartis, she worked at Eli Lilly in sales rep and marketing roles.
She dealt with The Workhouse in her previous role at Novartis, a company for which the agency still works.
‘I found it to be the most professional of all the agencies I have ever worked with and have respect for the people who work there,’ said Heffron. She said that a replacement for her had yet to be decided but an announcement would be made in the coming weeks.
In her current role, Heffron reports to GSK global director of product communications Gary Davies, overseeing around half of the firm’s product portfolio, including Levitra, Augmentin and Seretide.
At The Workhouse, she will report to agency founder and managing director Joanna Bright.
Bright said it was too soon to indicate which of the agency’s clients Heffron would handle, but added: ‘This is a newly created post, and [Heffron will be] the only associate director in the company.’
The Workhouse’s clients include Novartis, Wyeth Healthcare, Merck Sharp & Dohme, Otsuka and Bristol-Myers Squibb.
Heffron is the second senior communicator to depart GSK in recent weeks. It emerged three weeks ago that Kate James had quit her role as vice-president of international external relations to join emerging markets bank Standard Chartered as head of government relations and corporate social responsibility (PRWeek, 19 March).