She joins the City agency as MD and will work with chairman Alex Sandberg and chief executive Richard Nichols. Her primary responsibility will be the agency's financial practice, but she will also take on group-wide business development, including marketing and new business.
She was previously MD of Lowe Bell Good Relations and Ogilvy PR Worldwide - leaving the latter five years ago.
Zurcher said: 'I'm delighted to be back. College Hill is an exciting and fast-growing company and I couldn't have chosen a more interesting time to join an agency.'
Zurcher was first tempted back to in-house PR almost two years ago, becoming head of comms for tech firm and Microsoft partner 1E.