Livingston has previous political experience working for Jeremy Hunt MP on a range of issues, from media policy to the 2012 Olympics, and played a role in developing the Conservatives' culture, media and sport policy for their 2010 general election manifesto.
Livingston also worked for Andrew Mitchell MP during his stint as shadow International Development Secretary.
Livingston said: "I’m delighted to be joining Cicero Group during this time of exciting growth and I’m very much looking forward to leading its energy practice."
He also has comms experience in the energy sector, having worked for EDF Energy and the Swedish wind farm company Vattenfall.
Helena Walsh, executive director of Cicero Group, said: "Ewan has tremendous depth of knowledge and experience across the sector."