Richard S. Westfall  is best known for his biography of a mathematician who was a key figure in what?
Richard S. Westfall 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.
Henri Fehr Henri Fehr (Zurich, 2 February 1870 – 1954) was a Swiss mathematician. He was the founder of the Foundation for the Advancement of Mathematical Sciences, of the journal "Commentarii Mathematici Helvetici" and of the journal "L'Enseignement Mathématique" along with Charles-Ange Laisant. Fehr's interests in mathematics were scientific and social as is demonstrated by his involvement in academic life, committees for the improvement of mathematical instruction, education of teachers and internationalization of mathematics.