Reporting to Ian Twinn, director of public affairs at ISBA, Nassey will be responsible for media relations, content creation and ISBA’s digital channels.
ISBA has a corporate membership base of more than 400 companies including Unilever, HSBC and GlaxoSmithKline.
She joins ISBA at the beginning of October from Quidco where she was the corporate PR manager.
Nassey replaces Liam Northfield, who is now PR and comms manager at Turley.
Twinn said: "Advertisers continue to face challenges to keep pace with the fast-moving digital media environment, the changing agency scene and the pressures from regulatory threats. Our comms are key to our success in championing advertisers and their ads."
Nassey commented: "The developments in media and agency relationships, standards and technological advancements mean that ISBA’s members more than ever need to be a part of a representative body that’s committed to providing world-class education, support and content.
"The key to a successful communications strategy for ISBA moving forward will be to ensure that all our comms channels are aligned and that the advertisers’ interests are consistently front of mind."