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.
John Tierney (Australian politician)
Tierney was appointed to the Senate in February 1991 to succeed Peter Baume, who had resigned in January. Tierney was subsequently elected at the elections of 1993 and 1998. He resigned from the Senate in early 2005.