Hamman joins from social business agency Headshift where he was social media practice lead. Prior to this, he was senior community producer at the BBC. Hamman officially starts his role today and reports to Edelman's MD of digital Marcus Dyer.
Edelman director of digital strategy Marshall Manson said: 'Robin is joining as a Director in our digital practice. It's a newly created role that reflects our rapid expansion in the past few months. It also reflects the demand we're seeing from clients for developing social media strategies and using social media thinking.
'Robin will work with a number of our existing clients, but also work to develop new clients with particular emphasis in these areas.'
Hamman will be based in the London office.