Background: Murray Newton Rothbard (; March 2, 1926 - January 7, 1995) was an American heterodox economist of the Austrian School, a historian, and a political theorist whose writings and personal influence played a seminal role in the development of modern right-libertarianism. Rothbard was the founder and leading theoretician of anarcho-capitalism, a staunch advocate of historical revisionism, and a central figure in the twentieth-century American libertarian movement.
Context: Murray Rothbard's parents were David and Rae Rothbard, Jewish immigrants to the U.S. from Poland and Russia, respectively. David Rothbard was a chemist. Murray attended Birch Wathen, a private school in New York City. Rothbard later stated that he much preferred Birch Wathen to the "debasing and egalitarian public school system" he had previously attended in the Bronx. Rothbard wrote of having grown up as a "right-winger" (adherent of the "Old Right") among friends and neighbors who were "communists or fellow-travelers." Rothbard characterized his immigrant father as an individualist who embraced the American values of minimal government, free enterprise, private property, and "a determination to rise by one's own merits". "[A]ll socialism seemed to me monstrously coercive and abhorrent." He attended Columbia University, where he received a Bachelor of Arts degree in mathematics in 1945 and, eleven years later, his PhD in economics in 1956. The delay in receiving his PhD was due in part to conflict with his advisor, Joseph Dorfman, and in part to Arthur Burns rejecting his doctoral dissertation. Burns was a longtime friend of the Rothbard family and their neighbor at their Manhattan apartment building. It was only after Burns went on leave from the Columbia faculty to head President Eisenhower's Council of Economic Advisors that Rothbard's thesis was accepted and he received his doctorate. Rothbard later stated that all of his fellow students there were extreme leftists and that he was one of only two Republicans on the Columbia campus at the time. During the 1940s Rothbard became acquainted with Frank Chodorov and read widely in libertarian-oriented works by Albert Jay Nock, Garet Garrett, Isabel Paterson, H. L. Mencken and others, as well as Austrian economist Ludwig von Mises. In the early 1950s, when Mises was teaching at the Wall Street division of New York University Business School, Rothbard attended Mises' unofficial seminar. Rothbard was greatly influenced by Mises' book, Human Action. Rothbard attracted the attention of the William Volker Fund, a group that provided financial backing to promote various "right-wing" ideologies in the 1950s and early 1960s. The Volker Fund paid Rothbard to write a textbook to explain Human Action in a form which could be used to introduce college undergraduates to Mises' views; a sample chapter he wrote on money and credit won Mises's approval. For ten years, Rothbard was paid a retainer by the Volker Fund, which designated him a "senior analyst." As Rothbard continued his work, he enlarged the project. The result was Rothbard's book Man, Economy, and State, published in 1962. Upon its publication, Mises praised Rothbard's work effusively.
Question: what did he study?
Answer: he received a Bachelor of Arts degree in mathematics in 1945 and, eleven years later, his PhD in economics in 1956.

Background: Audra Ann McDonald (born July 3, 1970) is an American actress and singer. Primarily known for her work on the Broadway stage, she has won six Tony Awards, more performance wins than any other actor, and is the only person to win all four acting categories. She has performed in musicals, operas, and dramas such as A Moon for the Misbegotten, 110 in the Shade, Carousel, Ragtime, Master Class and Porgy and Bess. As a classical soprano, she has performed in staged operas with the Houston Grand Opera and the Los Angeles Opera and in concerts with symphony orchestras like the Berlin Philharmonic and New York Philharmonic.
Context: McDonald played Billie Holiday on Broadway in the play Lady Day at Emerson's Bar and Grill in a limited engagement that ended on August 10, 2014. After previews that began on March 25, 2014, the play opened at the Circle in the Square Theatre on April 13, 2014. Of the play, McDonald said in an interview: It's about a woman trying to get through a concert performance, which I know something about, and she's doing it at a time when her liver was pickled and she was still doing heroin regularly...I might have been a little judgmental about Billie Holiday early on in my life, but what I've come to admire most about her - and what is fascinating in this show - is that there is never any self-pity. She's almost laughing at how horrible her life has been. I don't think she sees herself as a victim. And she feels an incredible connection to her music - she can't sing a song if she doesn't have some emotional connection to it, which I really understand. McDonald won the Tony Award for Best Performance by an Actress in a Leading Role in a Play for this role, making her the first person to earn six Tony Award wins for acting (not counting honorary awards) and the first person to win a Tony Award in all four acting categories. In her acceptance speech, "she thanked her parents for encouraging her to pursue her interests as a child." She also thanked the "strong and brave and courageous" African-American women who came before her, saying in part, "I am standing on Lena Horne's shoulders. I am standing on Maya Angelou's shoulders. I am standing on Diahann Carroll and Ruby Dee, and most of all, Billie Holiday. You deserved so much more than you were given when you were on this planet. This is for you, Billie." This performance was filmed at Cafe Brasil in New Orleans and broadcast on HBO on March 12, 2016. McDonald received a 2016 Emmy Award nomination for Outstanding Lead Actress in a Limited Series or Movie for her role in the broadcast. McDonald had planned to make her West End debut as Holiday in Lady Day in June through September 2016, but after becoming pregnant she postponed these plans. She performed in Lady Day in June 2017 through September 9, 2017, at the Wyndham's Theatre in the West End.
Question: At what date and time was the Bar and Grill?
Answer:
After previews that began on March 25, 2014, the play opened at the Circle in the Square Theatre on April 13, 2014.