Question: When was the graduate school Mark Gerson attended created?

full_context: Document 1: Yale University: Yale is organized into fourteen constituent schools: the original undergraduate college, the Yale Graduate School of Arts and Sciences, and twelve professional schools. While the university is governed by the Yale Corporation, each school's faculty oversees its curriculum and degree programs. In addition to a central campus in downtown New Haven, the University owns athletic facilities in western New Haven, including the Yale Bowl, a campus in West Haven, Connecticut, and forest and nature preserves throughout New England. The university's assets include an endowment valued at $25.6 billion as of September 2015, the second largest of any educational institution.The Yale University Library, serving all constituent schools, holds more than 15 million volumes and is the third-largest academic library in the United States.
Document 2: ProQuest: Content is accessed most commonly through library Internet gateways. The current chief executive officer is Matti Shem Tov. ProQuest is part of Cambridge Information Group.
Document 3: National Training Laboratories: Kurt Lewin founded the National Training Laboratories Institute for Applied Behavioral Science, known as the NTL Institute, an American non-profit behavioral psychology center, in 1947. NTL became a major influence in modern corporate training programs, and in particular developed the T-groups methodology that remains in place today. Lewin died early on in the project, which was continued by co-founders Ron Lippitt, Lee Bradford, and Ken Benne, among others. The NTL Institute produced or influenced other notable and influential contributors to the human relations movement in post-World War II management though, notably Douglas McGregor (who, like Lewin, also died young), Chris Argyris and Warren Bennis.
Document 4: Gallup (company): Gallup, Inc. is an American research - based, global performance - management consulting company. Founded by George Gallup in 1935, the company became known for its public opinion polls conducted worldwide. It provides research and strategic consulting to large organizations in many countries, focusing on ``analytics and advice to help leaders and organizations solve their most pressing problems ''.
Document 5: Monitor Deloitte: Prior to its acquisition by Deloitte in January 2013, Monitor Deloitte was an American strategy consulting practice known as Monitor Group, which filed for chapter 11 bankruptcy in 2012. Monitor Group was founded in 1983 by six entrepreneurs with ties to the Harvard Business School, including Michael Porter. The advisory services now offered by Monitor Deloitte are in line with Monitor Group's legacy expertise, but expanded to a broader set of implementation and capabilities design focused on greater resilience to economic uncertainty.
Document 6: Yale University: Yale's residential college system was established in 1933 by Edward S. Harkness, who admired the social intimacy of Oxford and Cambridge and donated significant funds to found similar colleges at Yale and Harvard. Though Yale's colleges resemble their English precursors organizationally and architecturally, they are dependent entities of Yale College and have limited autonomy. The colleges are led by a master and an academic dean, who reside in the college, and university faculty and affiliates comprise each college's fellowship. Colleges offer their own seminars, social events, and speaking engagements known as "Master's Teas," but do not contain programs of study or academic departments. Instead, all undergraduate courses are taught by the Faculty of Arts and Sciences and are open to members of any college.
Document 7: Yale University: Other examples of the Gothic (also called neo-Gothic and collegiate Gothic) style are on Old Campus by such architects as Henry Austin, Charles C. Haight and Russell Sturgis. Several are associated with members of the Vanderbilt family, including Vanderbilt Hall, Phelps Hall, St. Anthony Hall (a commission for member Frederick William Vanderbilt), the Mason, Sloane and Osborn laboratories, dormitories for the Sheffield Scientific School (the engineering and sciences school at Yale until 1956) and elements of Silliman College, the largest residential college.
Document 8: Mark Gerson: Mark Gerson and fellow Yale Law School graduate Thomas Lehrman founded the Gerson Lehrman Group in 1998. Gerson Lehrman group, otherwise known as GLG, is a peer to peer business learning company. GLG is a knowledge brokerage and primary research firm that operates a membership-based platform of more than 600,000 independent consultants
Document 9: Yale University: The university hosts a variety of student journals, magazines, and newspapers. Established in 1872, The Yale Record is the world's oldest humor magazine. Newspapers include the Yale Daily News, which was first published in 1878, and the weekly Yale Herald, which was first published in 1986. Dwight Hall, an independent, non-profit community service organization, oversees more than 2,000 Yale undergraduates working on more than 70 community service initiatives in New Haven. The Yale College Council runs several agencies that oversee campus wide activities and student services. The Yale Dramatic Association and Bulldog Productions cater to the theater and film communities, respectively. In addition, the Yale Drama Coalition serves to coordinate between and provide resources for the various Sudler Fund sponsored theater productions which run each weekend. WYBC Yale Radio is the campus's radio station, owned and operated by students. While students used to broadcast on AM & FM frequencies, they now have an Internet-only stream.
Document 10: The Burke Group: The Burke Group is a U.S.-based international management consulting firm established in 1982 with headquarters in Los Angeles. The Burke Group describes itself as an "international leader" in guiding management during union recognition campaigns. It provides commercial services to private and public employers. Services are also offered toward business development and leadership training. Critics of The Burke Group call the firm's practices professional union busting.
Document 11: Yale University: Expansion caused controversy about Yale's new roles. Noah Porter, moral philosopher, was president from 1871 to 1886. During an age of tremendous expansion in higher education, Porter resisted the rise of the new research university, claiming that an eager embrace of its ideals would corrupt undergraduate education. Many of Porter's contemporaries criticized his administration, and historians since have disparaged his leadership. Levesque argues Porter was not a simple-minded reactionary, uncritically committed to tradition, but a principled and selective conservative. He did not endorse everything old or reject everything new; rather, he sought to apply long-established ethical and pedagogical principles to a rapidly changing culture. He may have misunderstood some of the challenges of his time, but he correctly anticipated the enduring tensions that have accompanied the emergence and growth of the modern university.
Document 12: Yale University: Yale expanded gradually, establishing the Yale School of Medicine (1810), Yale Divinity School (1822), Yale Law School (1843), Yale Graduate School of Arts and Sciences (1847), the Sheffield Scientific School (1847), and the Yale School of Fine Arts (1869). In 1887, as the college continued to grow under the presidency of Timothy Dwight V, Yale College was renamed Yale University. The university would later add the Yale School of Music (1894), the Yale School of Forestry & Environmental Studies (founded by Gifford Pinchot in 1900), the Yale School of Public Health (1915), the Yale School of Nursing (1923), the Yale School of Drama (1955), the Yale Physician Associate Program (1973), and the Yale School of Management (1976). It would also reorganize its relationship with the Sheffield Scientific School.
Document 13: BNI (organization): Business Network International (BNI) is an American franchised networking organization with around 200,000 members in 7,500 local chapters worldwide. Members meet regularly to discuss business and support each other's businesses by sharing referrals. It claims to be the world's leading 'referral organization'. In 2015, the organization says its members generated referrals resulting in over $9.3 billion in closed business worldwide. BNI was founded in 1985 by Ivan Misner.
Document 14: Yale University: Yale University is an American private Ivy League research university in New Haven, Connecticut. Founded in 1701 in Saybrook Colony as the Collegiate School, the University is the third-oldest institution of higher education in the United States. The school was renamed Yale College in 1718 in recognition of a gift from Elihu Yale, who was governor of the British East India Company. Established to train Congregationalist ministers in theology and sacred languages, by 1777 the school's curriculum began to incorporate humanities and sciences. In the 19th century the school incorporated graduate and professional instruction, awarding the first Ph.D. in the United States in 1861 and organizing as a university in 1887.
Document 15: University of Chicago: In business, notable alumni include Microsoft CEO Satya Nadella, Oracle Corporation founder and the third richest man in America Larry Ellison, Goldman Sachs and MF Global CEO as well as former Governor of New Jersey Jon Corzine, McKinsey & Company founder and author of the first management accounting textbook James O. McKinsey, Arley D. Cathey, Bloomberg L.P. CEO Daniel Doctoroff, Credit Suisse CEO Brady Dougan, Morningstar, Inc. founder and CEO Joe Mansueto, Chicago Cubs owner and chairman Thomas S. Ricketts, and NBA commissioner Adam Silver.
ground_truth: 1843
sub_queries: What university did Mark Gerson attend? Answer: Yale Law School
When was Yale Law School created? Answer: 1843