has spent more than 40 years conducting research into the behavior of unsaturated and expansive soils. Del presently heads the Golder Unsaturated Soils Group which is involved in the implementation of unsaturated soil mechanics into geotechnical engineering practice. Del has undertaken international programs of collaboration with countries such as China, Africa, and Vietnam.

Del Fredlund obtained his Ph.D. in 1973 and has spent 34 years teaching and conducting research at the University of Saskatchewan, Saskatoon. Del's research studies have focused on unsaturated soil mechanics and numerical modeling. He is the author, along with Dr. Harianto Rahardjo, of the book Soil Mechanics for Unsaturated Soils (1993). In 2012, he authored a second book on unsaturated soil mechanics titled Unsaturated Soil Mechanics in Engineering Practice , along with Dr. H. Rahardjo and M.D. Fredlund.

Del has been the recipient of numerous awards, amongst them the; Legett Award, 1999, the Terzaghi Award, 2005, and the Quigley Award, 2009. He is also a recipient of the Order of Canada and is a member of the Canadian Academy of Engineering.