He is considered internationally renowned expert in engineering mechanics,[1] specifically known for his work on shell analysis and thin-shell structure.
[4] After regular education he obtained his BSc in Mechanical Engineering from the University of Michigan in 1915.
In 1939 Donnell joined the Illinois Institute of Technology faculty, where he served as Professor of Mechanical Engineering until his retirement in 1962.
Donnell was founding editor of the engineering journal Applied Mechanics Reviews.
Donnell is known for his "stress-analysis research into cylindrical shells, which advanced development of monocoque (wherein the external frame helps supports structural load) bodies for automobiles and planes.