Jackaman was co-founder of top 90s financial comms agency Square Mile Communications with Susan Ellis.
He launched GJR PR in 2006, which was quickly merged with US-based Greentarget and took on its name later that year.
He currently serves as Greentarget’s chairman.
Before starting Greentarget, he was chairman of Weber Shandwick’s European financial PR practice after the agency bought Square Mile.
Jackaman is currently a non-executive director of Duet, the music finance specialist and chairman of the Deal Festival of Music and the Arts.
Co-founder Melissa Rowling remains MD for public relations, European Operations, while Nick Glanvill is chief executive officer of Greentarget’s European operations.