sentences:  He was a frequent visiting critic at East Coast schools of art during his teaching career.In the 1960s and '70s, his career flourished, with successful New York gallery shows and larger and larger scale commissions, culminating in "Triune,"(1975) a 20-foot-high structure of interlocking bronze curves.The physical effort required to complete "Triune" brought a check to Engman's artistic drive to "dominate the materials."