Stephen Herbert Hymer was a Canadian economist. His research focused on the activities of multinational firms, which was the subject of his PhD dissertation The International Operations of National Firms: A Study of Direct Foreign Investment, presented in 1960, but published posthumously in 1976, by the Department of Economics from Massachusetts Institute of Technology. Charles P. Kindleberger, his thesis supervisor, submitted it for publication, as mentioned by him on the introduction of Hymer's thesis dissertation.