McCourt will work alongside sister agencies EHS Brann Leeds and Euro RSCG in London and reports to business development director Tash Whitmey.
"Gerry's 13 years' experience of working with high-profile clients makes him the obvious choice for this challenging role," Whitmey said.
His appointment follows EHS Brann Discovery winning the GB Airways tasks. The agency will work on building the customer database and undertake a segmentation programme.
"I am delighted at the prospect of working for a company that puts such a focus on business development and innovation and I look forward to the challenge of growing the business across a diverse range of high-profile accounts," McCourt said.
EHS Brann Discovery clients include Diageo and Barclaycard.
In April, the agency appointed Whitmey as business development director and Paul MacSherry as business development manager.
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