He is Professor Emeritus at Drexel University and Director Emeritus of the Geosynthetic Institute .
Robert M. Koerner ( born December 2 , 1933 ) is an American engineer and academic .
Robert M. Koerner is engineer   at Drexel University and Director Emeritus of the Geosynthetic Institute .
Robert M. Koerner ( born December 2 , 1933 ) is an American engineer and academic .