1. Ivor Owen Grattan-Guinness was a historian of mathematics and logic.

1. Ivor Owen Grattan-Guinness was a historian of mathematics and logic.
Ivor Grattan-Guinness gained his bachelor degree as a Mathematics Scholar at Wadham College, Oxford, and an MSc in Mathematical Logic and the Philosophy of Science at the London School of Economics in 1966.
Ivor Grattan-Guinness was Emeritus Professor of the History of Mathematics and Logic at Middlesex University, and a Visiting Research Associate at the London School of Economics.
Ivor Grattan-Guinness was awarded the Kenneth O May Medal for services to the History of Mathematics by the International Commission on the History of Mathematics on 31 July 2009, at Budapest, on the occasion of the 23rd International Congress for the History of Science.
Ivor Grattan-Guinness was a fellow at the Institute for Advanced Study in Princeton, New Jersey, United States, and a member of the International Academy of the History of Science.
From 1974 to 1981, Ivor Grattan-Guinness was editor of the history of science journal Annals of Science.
Ivor Grattan-Guinness was an associate editor of Historia Mathematica for twenty years from its inception in 1974, and again from 1996.
Ivor Grattan-Guinness was a member of the Executive Committee of the International Commission on the History of Mathematics from 1977 to 1993.
Ivor Grattan-Guinness gave over 570 invited lectures to organisations and societies, or to conferences and congresses, in over 20 countries around the world.
From 1986 to 1988, Ivor Grattan-Guinness was the President of the British Society for the History of Mathematics, and for 1992 the Vice-President.
Ivor Grattan-Guinness was the Associate Editor for mathematicians and statisticians for the Oxford Dictionary of National Biography.
Ivor Grattan-Guinness took an interest in the phenomenon of coincidence and has written on it for the Society for Psychical Research.
Ivor Grattan-Guinness died of heart failure on 12 December 2014, aged 73, survived by his wife Enid Grattan-Guinness.
The personal papers of Ivor Grattan-Guinness are preserved at the Archives of American Mathematics.
The work of Ivor Grattan-Guinness touched on all historical periods, but he specialised in the development of the calculus and mathematical analysis, and their applications to mechanics and mathematical physics, and in the rise of set theory and mathematical logic.
Ivor Grattan-Guinness was especially interested in characterising how past thinkers, far removed from us in time, view their findings differently from the way we see them now.
Ivor Grattan-Guinness has emphasised the importance of ignorance as an epistemological notion in this task.
Ivor Grattan-Guinness did extensive research with original sources both published and unpublished, thanks to his reading and spoken knowledge of the main European languages.