David Sless was awarded an MSc by Durham University for his research in communication and information design. In 1975 He was appointed as lecturer in communication at Flinders University SA
In 1976 he became the Foundation Chairman of Standards Australiaʼs Committee on Signs and Symbols, and in 1985 was invited by Industry and Government to set up the not-for-profit Communication Research Institute.
He was Foundation Director of the Advanced Studies Program at the International Institute of Information Design, Adjunct Professor in Science Communication at the Australian National University, Adjunct Professor of Information Design at the University of Technology in Sydney, and Visiting Professor of Information Design at the Design Institute at Coventry University.
He is author of over 200 publications.