“With 61 years on the faculty in the math department, Gil Strang has been the longest serving faculty member in the history of the department,” professor Michel X. Goemans, head of the MIT Department of Mathematics, said in a statement. “He has had a tremendous impact on the teaching of mathematics to tens of thousands of students at MIT through his lectures, to countless of students at other academic institutions through his textbooks, and to millions of people all over the globe through his online lectures and digital media.”