From a current advertisement for a senior position in the public service of the Australian Commonwealth Government, preparing for Australia’s hosting of a meeting of the G20 in 2014:

Department of Prime Minister and Cabinet
Head of Policy
G20 Taskforce
The Head of Policy will lead and manage complex and cross-cutting policy development across government, including international engagement and providing support to the Prime Minister and the Prime Minister’s sherpa for G20 meetings in 2012 and 2013 and Australia’s hosting in 2014.  . . . “

 
Note the absence of quotation marks or italics.    A list of G20 sherpas and sous-sherpas can be found here.