Gordon Mortrude challenged teachers to treat their students with respect and kindness, even at times when students were acting out.
This was back in the mid-1960s, before that approach had a name and before school districts and teachers across the country were grappling with ways to discipline students in less punitive ways.
"He was a big fan of using humor and being generous with students," said Mark Mortrude, Gordon's eldest son.
Gordon Mortrude died of natural causes July 8 at 87.
Mortrude, a Greenbush native, began his teaching career at Sauk Rapids High School and later went on to teach in San Bernardino, Calif.
In 1990, he moved back to Minnesota to become a professor at St. Cloud State University's School of Education. Mortrude held a doctoral degree in teacher education.
Mark Mortrude said his father's most popular class delved into the difficult subject of student discipline and school culture.
Future educators would discuss how they would discipline a child in various situations. Still, regardless of the infraction, Mark said his father always believed in rewarding positive behavior.