Louis André (Loet) Leydesdorff (21 August 1948, Batavia (Dutch East Indies) - 11 March 2023, Amsterdam[1][2]) was a Dutch sociologist, cyberneticist, communication scientist and Professor in the Dynamics of Scientific Communication and Technological Innovation at the University of Amsterdam.

[5][6] In 1969 Leydesdorff started working as part-time professor for chemical technology at the Gerrit Rietveld Academie in Amsterdam.

Leydesdorff's research interests were in the fields of the philosophy of science, social network analysis, scientometrics, and the sociology of innovation.

His studies in communication in science, technology, and innovation enabled him to specify theory and methods for understanding the dynamics of knowledge-based development.

Leydesdorff has published extensively in fields of systems theory, social network analysis, scientometrics, and the sociology of innovation.