Question: What was the law firm that a woman who formerly worked with the winner of the 2000 United States Senate election of New York?   

Context paragraphs:
United States Senate election in Vermont, 2000: The 2000 United States Senate election in Vermont took place on November 7, 2000.  Incumbent Republican U.S. Senator Jim Jeffords won re-election to a third term in office.  Jeffords switched from being a Republican to an independent, who would caucus with the Democratic Party, thus breaking the 50-50 lock.  As of 2017, this is the last Senate election in Vermont won by a Republican.

United States Senate election in New Jersey, 2000: The 2000 United States Senate election in New Jersey was held on November 7, 2000.  Incumbent Democratic U.S. Senator Frank Lautenberg decided to retire, rather than seeking a fourth term.  The Democratic nominee, former CEO of Goldman Sachs Jon Corzine, defeated the Republican nominee, U.S. Representative Bob Franks, in a close election.

United States Senate election in Delaware, 2000: The 2000 United States Senate election in Delaware was held on November 7, 2000, in conjunction with the 2000 U.S. presidential election, other elections to the United States Senate in other states, as well as elections to the United States House of Representatives, and various state and local elections.  Incumbent Republican U.S. Senator William Roth ran for re-election to a sixth term, but was defeated by Governor Tom Carper.

United States Senate election in New York, 2016: The 2016 United States Senate election in New York was held on November 8, 2016, to elect a member of the United States Senate to represent the State of New York, concurrently with the 2016 U.S. presidential election, as well as other elections to the United States Senate in other states and elections to the United States House of Representatives and various state and local elections.  The primaries took place on June 28.

United States Senate election in Indiana, 2010: The 2010 United States Senate election in Indiana took place on November 2, 2010, alongside 33 other elections to the United States Senate in other states and elections to the United States House of Representatives and various state and local elections to fill Indiana's class III United States Senate seat.  Incumbent Democratic U.S. Senator Evan Bayh decided in February 2010 to retire instead of seeking a third term shortly after former U.S. Senator Dan Coats announced his candidacy for Bayh's contested seat.  No Democratic candidate submitted enough signatures by the deadline to run, leading Democratic officials to choose U.S. Congressman Brad Ellsworth to be the nominee.  The Libertarian Party nominated YMCA instructor Rebecca Sink-Burris, who had previously run against Evan Bayh in the United States Senate election in Indiana, 1998 but with less success than in this election.  Republican nominee and former U.S. Senator Dan Coats won the open seat.

United States Senate election in New York, 1992: The 1992 United States Senate election in New York took place on November 3, 1992 alongside other elections to the United States Senate in other states as well as elections to the United States House of Representatives and various state and local elections.  Incumbent Republican U.S. Senator Al D'Amato won re-election to a third term.  As of 2016, this is the last Senate election in New York won by a Republican.

Ann O'Leary: Ann M. O'Leary (born 1971 or 1972) is an American political advisor, lawyer, and nonprofit leader who specializes in early childhood education.  She worked in the Bill Clinton administration and for Hillary Clinton during her time as First Lady, Senate career, and 2008 and 2016 presidential campaigns.  She served in leadership positions at various nonprofit organizations that focus on early childhood education, including Next Generation and the Opportunity Institute.  After Clinton's unsuccessful 2016 presidential campaign, O'Leary became a lawyer at the Palo Alto office of the law firm Boies, Schiller & Flexner.

United States Senate elections in New York, 1845: The 1845 United States Senate special election in New York was held on January 18, 1845 by the New York State Legislature to elect two U.S. Senators (Class 1 and Class 3) to represent the State of New York in the United States Senate.  The regular 1845 United States Senate election in New York was held on February 4, 1845, to elect a U.S. Senator (Class 1) to represent the State of New York in the United States Senate.

United States Senate career of Hillary Clinton: Hillary Rodham Clinton served as a United States Senator from New York from January 3, 2001 to January 21, 2009.  She won the United States Senate election in New York, 2000 and the United States Senate election in New York, 2006.  Clinton resigned from the Senate on January 21, 2009 to become United States Secretary of State for the Obama Administration.

United States Senate election in Missouri, 2000: The 2000 United States Senate election in Missouri was held on November 7, 2000, to select the next U.S. Senator from Missouri.  Incumbent Senator John Ashcroft lost the election to Mel Carnahan, despite the fact that Carnahan had died in a plane crash three weeks before election day.

Supporting paragraphs: Ann O'Leary United States Senate career of Hillary Clinton
Answer: Boies, Schiller & Flexner