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.
Father of the Australian Senate
The first Senate was elected on 29 and 30 March 1901. Despite the different election dates, all the members elected to that first Parliament were considered to have had equal seniority. It follows that there could not be a "longest-serving Senator" until only one Senator from the first Parliament was still serving. That occurred on 14 September 1923 with the death of Hon Edward Millen, leaving Sir George Pearce as the sole longest-serving Senator, and thus the first sole Father of the Senate.