Until NATO public diplomacy posts the official list, you can see from
timeturk.com that the other members of the group are:“Britain’s former Defense Minister Geoff Hoon, head of the French National Library Bruno Racine, Italian ambassador Giancarlo Aragona, Canadian ambassador Marie Gervais-Vidricaire, Spanish ambassador Fernando Perpina-Robert Peyra, German ambassador Hans-Friedrich von Ploetz, Latvian ambassador Aivis Ronis, Greek ambassador Yannis-Alexis Zepos and Polish professor Adam Daniel Rotfeld,” and Turkey’s former Ambassador to NATO, Umit Pamir.
Update: You can now see the official list, with photos and brief bios, at the NATO website.