Spiegel is founder and CEO of OMG search specialist . He will be succeeded at Resolution Media by Dave Gould who has been promoted from senior vice-president to president.
He takes up his new position next week and will report to Daryl Simm, CEO of . He will have global responsibility for digital across all OMG companies.
In addition to leading digital initiatives across OMG, Spiegel will also have reporting responsibility for digital investment, product development and digital analytics. Resolution Media and emerging media firm Next will also report to Spiegel.
OMG, which is estimated to oversee around $2bn in digital media spend, said its digital growth stemmed from the integration of digital strategy into its client teams at its media buying agencies OMD and PHD.
Simm said: "This ensures that all our clients have access to the very best capabilities in digital. Matt has an outstanding profile to lead this effort, including an entrepreneurial spirit to get things done, the experience of over a decade in digital media, and an understanding of our clients' needs."