Question: Richard S. Westfall  is best known for his biography of a mathematician who was a key figure in what?

Context articles: Govind Ballabh Pant
List of accolades received by The Imitation Game
Alexander Lavut
Chris Westfall
Isaac Newton
Benjamin Fillon
History of Seattle before 1900
Richard Hilleman
Richard Lashof
Richard S. Westfall

Pandit Govind Ballabh Pant (10 September 1887 – 7 March 1961) was an Indian freedom fighter and one of the architects of modern India.
 Alongside Mahatma Gandhi, Jawaharlal Nehru and Vallabh Bhai Patel, Pant was a key figure in the movement for India's Independence and later a pivotal figure in the Indian Government.
 He was one of the foremost political leaders of Uttar Pradesh (then known as United Provinces) and a key player in the movement to establish Hindi as the official language of India.
"The Imitation Game" is a 2014 British-American historical thriller film about British mathematician, logician, cryptanalyst and pioneering computer scientist Alan Turing, a key figure in cracking Nazi Germany's Enigma code that helped the Allies win the Second World War, only to later be criminally prosecuted for his homosexuality.
 It stars Benedict Cumberbatch as Turing and is directed by Morten Tyldum with a screenplay by Graham Moore, based on the biography "" by Andrew Hodges.
Alexander Pavlovich Lavut (Russian: Алекса́ндр Па́влович Лаву́т ; 4 July 1929 – 23 June 2013) was a mathematician, dissident and a key figure in the civil rights movement in the Soviet Union.
Chris Westfall is an American motivational speaker, entrepreneur and author based in Houston, TX, best known as the national elevator pitch champion.
 He is the author of "The NEW Elevator Pitch" and "BulletProof Branding".
 According to prime time television host Jeffrey W. Hayzlett, Westfall has the best two-minute speech in the United States.
 In his book, ""The Mirror Test"", Hayzlett says that the new elevator speech is 118 seconds long – about the length of the average elevator ride in New York City.
 Westfall was recognized as the grand prize winner of the elevator pitch competition.
 Westfall has appeared on CNN, ABC NEWS, NBC-TV, and in media outlets such as U.S. News and World Report.
Sir Isaac Newton {'1': ", '2': ", '3': ", '4': "} ( ; 25 December 1642 – 20 March 1726/27) was an English mathematician, astronomer, and physicist (described in his own day as a "natural philosopher") who is widely recognised as one of the most influential scientists of all time and a key figure in the scientific revolution.
 His book "Philosophiæ Naturalis Principia Mathematica" ("Mathematical Principles of Natural Philosophy"), first published in 1687, laid the foundations of classical mechanics.
 Newton also made pathbreaking contributions to optics, and he shares credit with Gottfried Wilhelm Leibniz for developing the infinitesimal calculus.
Benjamin Fillon (15 March 1819 – 23 May 1881) was a French numismatist and archaeologist.
 Much of his lifetime's work was devoted to researching the French mathematician, Franciscus Vieta, a key figure in developing new algebra.
Two conflicting perspectives exist for the early history of Seattle.
 There is the "establishment" view, which favors the centrality of the Denny Party (generally the Denny, Mercer, Terry, and Boren families), and Henry Yesler.
 A second, less didactic view, advanced particularly by historian Bill Speidel and others such as Murray Morgan, sees David Swinson "Doc" Maynard as a key figure, perhaps "the" key figure.
 In the late nineteenth century, when Seattle had become a thriving town, several members of the Denny Party still survived; they and many of their descendants were in local positions of power and influence.
 Maynard was about ten years older and died relatively young, so he was not around to make his own case.
 The Denny Party were generally conservative Methodists, teetotalers, Whigs and Republicans, while Maynard was a drinker and a Democrat.
 He felt that well-run prostitution could be a healthy part of a city's economy.
 He was also on friendly terms with the region's Native Americans, while many of the Denny Party were not.
 Thus Maynard was not on the best of terms with what became the Seattle Establishment, especially after the Puget Sound War.
 He was nearly written out of the city's history until Morgan's 1951 book "Skid Road" and Speidel's research in the 1960s and 1970s.
Richard Hilleman is an American computer game and video game producer best known for his work creating the original Madden Football game for video game consoles for Electronic Arts.
 Apart from "Madden", Hilleman was a key figure in building the massive EA Sports brand and has spent over 20 years working in product development at EA.
 He has directly or indirectly influenced a wide range of games and game designers.
Richard K. Lashof (November 9, 1922 – February 4, 2010) was an American mathematician.
 He contributed to the field of geometric and differential topology, working with Shiing-Shen Chern, Stephen Smale, among others.
 Lashof is regarded as "the key figure in sustaining the Chicago Mathematics Department as an international center for research and the training of topologists" by Melvin Rothenberg.
Richard S. Westfall (April 22, 1924 – August 21, 1996) was an American academic, biographer and historian of science.
 He is best known for his biography of Isaac Newton and his work on the scientific revolution of the 17th century.