Prof. (emeritus) David Avnir (Hebrew: דוד אבניר; born 12 June 1947; St. Ottilien, Germany) is an Israeli Professor of chemistry at the Institute of Chemistry, The Hebrew University of Jerusalem, where he also obtained all his academic training, and where he has held the positions of Head of the School of Chemistry, Head of the Institute of Chemistry, and Head of the Graduate School of the Experimental Sciences. His current scientific activities include sol-gel materials, molecularly doped metals, chirality and symmetry in experiments and theory. Earlier interests included fractals in chemistry and far-from-equilibrium phenomena. He has co-authored more than 400 papers (2020), many of which are highly cited. Co-founder of the International Sol-Gel Society and its first chairman of the board