On January 19, 1946, Dart married the former Wilhelmina Plansoen, a Duke University alumna.
At Yale Dart also studied under Pietro Belluschi, Marcel Breuer, Richard Neutra, Louis Kahn, Eero Saarinen, Harold Spitznagel, and Paul Schweikher, whom he later worked under in Roselle, IL from 1949 to 1950.
He developed his personal design style of using natural materials, incorporating a building into its site and free- flowing spaces while at Yale.
[3] The cause of death was an aneurysm while completing a significant commercial development, Water Tower Place.
The archives of the Ryerson & Burnham Libraries, located at the Art Institute of Chicago, house a permanent collection of his works, donated in 1999 by his sister Susan.