David A. Lange is Professor of Civil Engineering at the University of Illinois at Urbana-Champaign.  He arrived at Illinois in 1992, and developed a research group focusing on concrete materials, including microstructure-property relationships, characterization of pore structure, drying phenomenon and measurement of internal relative humidity gradients, shrinkage/creep, and cracking.  Special topics such as self-consolidating concrete, recycled concrete aggregate, internal curing with superabsorbent polymers, and 3D printing have also drawn his attention.  Lange served as Associate Head of the Department of Civil and Environmental Engineering from 2004-10.  He is a Fellow of the American Ceramic Society.   He is also a Fellow of the American Concrete Institute and winner of its Wason Medal in 2003 and 2018.  He served as ACI President in 2018-19.