Leader of the Government in the Senate (Australia)
The current Leader of the Government in the Senate is Mathias Cormann. The current Deputy Leader of the Government in the Senate is Simon Birmingham, who was appointed on the same date following the resignation of Mitch Fifield.
Department of Defence (Australia)
The head of the Department, who leads it on a daily basis, is the Secretary of the Department of Defence (SECDEF), currently Greg Moriarty. The Secretary reports to the Minister of Defence, currently The Hon. Christopher Pyne MP, following appointment by Prime Minister Scott Morrison in August 2018.