"At first it was like therapy, but now it's what I do," the Kentwood man said Wednesday.
Kristan has an extensive 9/11 collection of memorabilia. His truck is emblazoned with images of that day and the twin towers are tattooed on his left arm.
"This is what I do," he said. "This is my passion."
This year, people driving along I-196 near Grandville may catch a glimpse of a billboard Kristan was responsible for. It's a digital image that alternates with other commercial messages. Each lasts about eight seconds.
Kristan said it's his way to make the 9/11 story not fall through the cracks of history.
"I thought it would be great," he said. "A child might be driving down the highway with their mom and say, 'Mom what's that 9/11 thing?' and then the 9/11 story would be told by the parent to the children."