Question: Which long-serving Australian politician and Attorney-General stepped down from his seat at Berowra in 2016, after endorsing Julian Leeser as his successor?

Context paragraphs:
Harry Foll: Hattil Spencer "Harry" Foll (30 May 1890 – 7 July 1977) was a long-serving Australian politician and Minister of State.

Walter Cooper (Queensland politician): Sir Walter Jackson Cooper, MBE (23 April 1888 – 22 July 1973) was a long-serving Australian politician.

Julian Leeser: Julian Martin Leeser (born 25 May 1976) is a Liberal Party of Australia member who won the Seat of Berowra at the 2016 Australian election, having been endorsed as a candidate in April 2016 to replace former Attorney-General Philip Ruddock.

Fred Daly (politician): Frederick Michael Daly {'1': ", '2': ", '3': ", '4': "} (13 June 1912 – 2 August 1995) was a long-serving Australian Labor Party politician, a member of the Australian House of Representatives for 32 years from 1943 to 1975, and Minister for Administrative Services in the government of Gough Whitlam (1972–75).

Philip Ruddock: Philip Maxwell Ruddock (born 12 March 1943) is an Australian politician who is currently mayor of Hornsby Shire.  He previously was a Liberal member of the House of Representatives from 1973 to 2016.  First elected in a 1973 by-election, by the time of his retirement he was the last parliamentary survivor of the Whitlam and Fraser Governments.  He was both the Father of the House and the Father of the Parliament from 1998 to his retirement.  He is the second longest-serving parliamentarian in the history of the Australian Parliament (only Billy Hughes served longer).  Ruddock served continuously in federal cabinet during the Howard Government, as Minister for Immigration and Multicultural Affairs from 1996 to 2003, and then Attorney-General from 2003 to 2007.

Gordon Brown (Australian politician): Gordon Brown (11 February 1885 – 12 January 1967) was a long-serving Australian politician.

Tom Hughes (Australian politician): Thomas Eyre Forrest "Tom" Hughes AO QC (born 26 November 1923) is a former Australian politician and a prominent barrister practising at Blackstone Chambers in Sydney, who served as the 19th Attorney-General of Australia from 1969 to 1971.  He was a Liberal member of the Australian House of Representatives from 1963 to 1972, representing first the seat of Parkes and then (when Parkes was abolished in 1969) the seat of Berowra.

Vickie Chapman: Vickie Ann Chapman (born 21 June 1957) is an Australian politician, representing the South Australian House of Assembly seat of Bragg for the South Australian Division of the Liberal Party of Australia since the 2002 election.  She was Deputy Leader of the Opposition from 30 March 2006 until 4 July 2009 and returned to that position on 4 February 2013.  She is also the Shadow Attorney-General and Shadow Minister for State Development, having gained the extra portfolio of State Development in a cabinet reshuffle on 13 January 2016.

Joe Collings: Joseph Silver "Joe" Collings (11 May 1865 – 20 June 1955) was a long-serving Australian politician.  He was a hardworking Australian Labor Party bureaucrat with valuable writing and speaking talents, who was eventually rewarded by a five-year stint as a federal government minister.

Justin O'Byrne: Justin Hilary O'Byrne, AO (1 June 1912 – 10 November 1993) was a long-serving Australian Labor Party politician who represented Tasmania in the Federal Senate from 1947 to 1981, and was President of the Senate from 1974 to 1975.

Supporting paragraphs: Julian Leeser Philip Ruddock
Answer: Philip Ruddock