Question: When was the actor born who played the founder and leader of the Order of the Phoenix in the last six films of the series?

Context paragraphs:
Albus Dumbledore: Professor Albus Percival Wulfric Brian Dumbledore is a fictional character in J. K. Rowling's "Harry Potter" series.  For most of the series, he is the headmaster of the wizarding school Hogwarts.  As part of his backstory, it is revealed that he is the founder and leader of the Order of the Phoenix, an organisation dedicated to fighting Lord Voldemort.

Mohammad Tauqir: Mohammad Tauqir Khan (Arabic: توقير محمد‎ ‎ ; born January 14, 1972 in Dubai) is a United Arab Emirates cricketer.  He is a UAE national.  He is a lower order batsman and off-spin bowler, he played his first game for UAE in the final of 1996 ACC Trophy (batting at 11 and not bowling).  He has been part of the UAE team in the last three ICC Trophys and last six ACC Trophys.  His best bowling performance came against Japan with 6–10 off 10 overs in the 2000 ACC Trophy.

1999–2000 BAI Basket: The 1999–2000 Season of BAI Basket (31st edition) ran from November 20, 2008 through May 16, 2000, with 8 teams playing in three different stages: in stage one (regular season) teams played a double round robin system.  In stage two, the six best teams played a single round robin tournament in serie A and the last six did the same for the consolation group, serie B. Finally, in stage three (final four) the best four teams from serie A played in a round robin at four rounds for the title.  The winners of the regular season and of the serie A are awarded a bonus point for the serie A and the final four, respectively.

2007–08 BAI Basket: The 2007-2008 Season of BAI Basket (30th edition) ran from November 21, 2008 through May 16, 2009, with 12 teams playing in three different stages: in stage one (regular season) teams played a double round robin system.  In stage two, the six best teams played a single round robin tournament in serie A and the last six did the same for the consolation group, serie B. Finally, in stage three (final four) the best four teams from serie A played in a round robin at four rounds for the title.  The winners of the regular season and of the serie A are awarded a bonus point for the serie A and the final four, respectively.

Michael Gambon: Sir Michael John Gambon {'1': ", '2': ", '3': ", '4': "} (born 19 October 1940) is an Irish-born English actor who has worked in theatre, television and film.  Gambon has played the eponymous mystery writer protagonist in the BBC television serial "The Singing Detective", Jules Maigret in the 1990s ITV serial "Maigret", and Professor Albus Dumbledore in the final six "Harry Potter" films after the death of previous actor Richard Harris.  He has won four BAFTA TV Awards and three Olivier Awards.

2009–10 BAI Basket: The 2009-2010 Season of BAI Basket (32nd edition) ran from November 13, 2009 to June 15, 2010, with 12 teams playing in three different stages: in stage one (regular season) teams played a double round robin system.  In stage two, the six best teams played a single round robin tournament in serie A and the last six did the same for the consolation group, serie B. Finally, in stage three (final four) the best four teams from serie A played in a round robin at four rounds for the title.  The winners of the regular season and of the serie A are awarded a bonus point for the serie A and the final four, respectively.

Dennis McKinney: Dennis McKinney (born July 24, 1960) is a former Kansas State Treasurer.  He was a member of the Kansas House of Representatives where he represented the 116th House District for ten terms, the last six as the Democratic Party's leader (Minority Leader) in the Kansas House.  In January 2017, he was a Democratic candidate for the party's nomination as the 4th District of Kansas nominee in the U.S. House of Representatives.  At the Democrats' 4th District nominating convention February 10, 2017, he narrowly lost to James Thompson.

Lego Harry Potter: Lego "Harry Potter" is a Lego theme based on the films of the "Harry Potter" series.  Lego models of important scenes, vehicles and characters were made for the first six films and all the books released.  The first sets appeared in 2001, to coincide with the release of the first film "Harry Potter and the Philosopher's Stone" (Harry Potter and the Sorcerer's Stone in the United States).  Subsequent sets were released alongside the new films, until Harry Potter and the Order of the Phoenix.  The line then went dormant for three years.  It is unknown if the theme will again be revived to coincide with future installations in the Harry Potter franchise, such as the film Fantastic Beasts and Where to Find Them.

2000 Motor City Bowl: The 2000 Motor City Bowl was a National Collegiate Athletic Association bowl game in which the Marshall Thundering Herd of the MAC defeated the Cincinnati Bearcats of the Conference USA 25–14.  It was played on December 27, 2000 at the Pontiac Silverdome in Pontiac, Michigan.  The Bearcats were C-USA runners-up fresh off the wins from five of their last six games, which included Syracuse and #20 Southern Mississippi.  Marshall however was the four-time MAC champion who had also won five of their last six games, one of which was against Western Michigan, who had defeated them earlier in the season, in the MAC Championship Game.

Lionel Barrymore: Lionel Barrymore (born Lionel Herbert Blythe; April 28, 1878 – November 15, 1954) was an American actor of stage, screen and radio as well as a film director.  He won an Academy Award for Best Actor for his performance in "A Free Soul" (1931), and remains best known to modern audiences for the role of the villainous Mr. Potter character in Frank Capra's 1946 film "It's a Wonderful Life".  He is also particularly remembered as Ebenezer Scrooge in annual broadcasts of "A Christmas Carol" during his last two decades.  He is also known for playing Dr. Leonard Gillespie in MGM's nine Dr. Kildare films, a role he reprised in a further six films focussing solely on Gillespie and in a radio series entitled "The Story of Dr. Kildare".  He was a member of the theatrical Barrymore family.

Supporting paragraphs: Michael Gambon Albus Dumbledore
Answer: 19 October 1940