Fellows are expected to be established scholars and typically have the rank of associate professor or higher.
The deceased honorary fellows include H. S. M. Coxeter, Paul Erdős, Haim Hanani, Bernhard Neumann, D. H. Lehmer, Leonard Carlitz, Robert Frucht, E. M. Wright, and Horst Sachs.
Living honorary fellows include S. S. Shrikhande, C. R. Rao, G. J. Simmons, Simmons and Sos are no longer alive, same for Shrikhande afaik Vera Sós, Henry Gould, Carsten Thomassen, Neil Robertson, Cheryl Praeger, and R. M.
[6] The ICA awards the Euler Medals annually for distinguished career contributions to combinatorics by a member of the institute who is still active in research.
The Stanton Medal honours significant lifetime contributions to promoting the discipline of combinatorics through advocacy, outreach, service, teaching and/or mentoring.