Longley joins from Hays where she became its first group head of social media, following five years at media agency MEC UK where she created its social media practice.
Adrian Brady, chief executive of Eulogy, said: "We know what our clients want in this market. Ann brings senior client-side and media agency expertise; two assets sadly lacking too often in today’s PR market. Bringing Ann into our team is a massive coup for Eulogy as we continue to drive our digital offer to the heart of the business and ensure we have a senior team that can respond to the needs of our diverse client base."
Longley added: "I’m excited to be part of a team that is identifying and developing the future trends for PR and communications services. Clients are adapting to new communication channels and I’m committed to ensuring they understand next generation digital opportunities while successfully navigating the current multi-platform landscape."
As part of her role Longley will manage client teams for Amex, Royal Mail Stamps and Tata Consulting Services.