Parliament of Australia
From 1901 to 1949, the House consisted of either 74 or 75 members (the Senate had 36). Between 1949 and 1984, it had between 121 and 127 members (the Senate had 60 until 1975, when it increased to 64). In 1977, the High Court ordered that the size of the House be reduced from 127 to 124 members to comply with the nexus provision. In 1984, both the Senate and the House were enlarged; since then the House has had between 148 and 150 members (the Senate has 76).
President of the Senate
The President of the Australian Senate is a senator, traditionally a member of the governing party or coalition, elected by the Senate at the beginning of each parliament as the first item of business. They are assisted by a Deputy President who is traditionally a member of the largest opposition party. The current president is Scott Ryan, a Liberal senator from Victoria, who has held the office since 13 November 2017.