The other American, Donald C. Winter. He is the senior member on the Expert Advisory Panel for the Australian Submarine selection. Winter is also former Secretary of the US Navy and former Corporate Vice President Northrop Grumman. (Photograph Courtesy Northrop Grumman)
See this February 2015 Defence Ministerial Media Release where it says:
"the Government has endorsed a set of key strategic requirements for our future submarines:...c) The combat system and heavyweight torpedo jointly developed between the United States and Australia as the preferred combat system and main armament."
5. does it mean the Submarine Program and the 2016? Defence White Paper will be delayed? See the Brisbane (Australia) Courier Mail, Nov 3, 2015 "...defence sources suggest that the new Defence White Paper might not be released until after Christmas and possibly not until after the next election."
Having two Americans in key positions is not necessarily questionable. They may be the best men for the jobs. Equally Australians would fill such positions within the Pentagon-shipbuilding complex - wouldn't they?