Gerald James Toomer (born 23 November 1934) is a historian of astronomy and mathematics who has written numerous books and papers on ancient Greek and medieval Islamic astronomy.
In particular, he translated Ptolemy's Almagest into English.
Formerly a fellow of Corpus Christi College, Cambridge University, he moved to Brown University as a special student in 1959 to study "the history of mathematics in antiquity and the transmission of these systems through Arabic into medieval Europe.
"[1] He joined the History of Mathematics department in 1963, became an associate professor in 1965, and was the chairman from 1980 to 1986.
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