When Highland gained its full student body through the 12th grade, Collett's duties expanded to include German.
"I served in the Army in Germany during the Korean conflict period, so they thought I could teach German as well."
Later, he was asked to teach Russian.
"I had gone on a mission to Sweden [for The Church of Jesus Christ of Latter-day Saints] and spoke that language," he said. "They wanted a Russian program and decided [Swedish] was close enough."
He signed up for a night class at the University of Utah and stayed just ahead of his students as they learned Russian together. That summer, he took more comprehensive courses at San Francisco State so he could be better versed when the next batch of students arrived.
Collett taught German and Russian until the mid-1980s, when he became a counselor, a position he has held ever since.
"He has saved many kids who were lost or confused or getting into some trouble," said University of Utah professor Pat Shea, an attorney and former Democratic Party state chairman. "I was one of them."
Shea was arguing with his teachers too much when he was a Highland student in the 1960s. Collett, who had taken Shea on one of his annual trips to Russia with his students, intervened, and, with other teachers, got the youth enrolled in debate, where he could channel his precociousness in a more positive direction.
There, Shea excelled.
When Collett began his Highland career, the girls wore poodle skirts and bobby socks. Many of the boys wore ties to school. It was a far cry from the tattoos and piercings many kids sport today.
But the character of the students hasn't changed, he says. "They're still basically the same."
What has changed is the school's diversity.
"When I began, we took kids just from the east side of the city and the student body was practically all white," he said. But when South High School closed [in 1988], we took a lot of their kids from the west side, and now our population is more than a quarter minorities."
To Collett, that richness has strengthened the school.