It was in 2007, and he was completing his studies in visual effects.
"I didn't even know whether I could even do that as a career. I thought I would be poor all my life," he said in an interview.
Montminy-Brodeur's father, Raymond Brodeur, was a well-known theologian at Laval University in Quebec City. His mother, Lisette Montminy, also taught theology there.
"They never tried to shove religion down our throats. They always gave us a choice, letting us do our own choices. It's thanks to that that I felt I could do something as unorthodox as visual effects," he said.
"A lot of friends have asked me over the years if I was a 'Jesus freak,' growing up in a family like that. No. Precisely because I always had this liberty," he added.
He ended up working a few months for the Archdiocese of Quebec in 2007 and 2008, as it was preparing for the International Eucharistic Congress. The church of Quebec felt it needed to upgrade its communications capabilities by including video coverage. Montminy-Brodeur was hired to help with camera work, video editing and 3-D animations. A lot of his work was shown on the big screen in the Pepsi Center where the congress was held.
"What I liked about my time at the archdiocese was to see the motivation of people who had a message to deliver. There were a lot of volunteers. I thought it was super cool to stand alongside people that were convinced of the importance of their message. At one point, I was afraid they would judge me because I wasn't as ardent as them. I felt like a black sheep. But in the end, everything was fine, and I kept in touch with a lot of the guys," he said.
After the International Eucharistic Congress, he left for England, where he ended up working on his first big movie, "Where the Wild Things Are." In 2009, he returned to Montreal to work for Rodeo FX. The studio only had 25 employees back then. It now has 350 in Montreal, Los Angeles and Quebec City.
This new challenge allowed him to work on movies like "Avatar," "Sherlock Holmes," "Harry Potter," "The Hunger Games," "Birdman" and "Twilight." But the real game changer came when the studio got the contract for the fourth, fifth and sixth seasons of "Game of Thrones." For the past three years, Montminy-Brodeur has worked six months a year on this project. As a compositor supervisor for visual effects, he's supervisor Matthew Rouleau's right-hand-man.
"I couldn't have hoped for a better job at this point in my career. I'm really happy with my evolution," he explained, saying he supervises the work of around 40 artists.
"We want the result to be as true and beautiful as possible. It's a mix of logic and art. You have to always to on the lookout, when you're outside, to see how light affects all the elements."
In February, Montminy-Brodeur won a Visual Effects Society award: best virtual environment in a television series for his 30-second clip of Volantis, a city in the "Game of Thrones" universe.
When Rodeo FX won the Emmy with "Game of Thrones." Montminy-Brodeur was in Los Angeles for the ceremony, a moment that made him proud. It was the studio's third consecutive Emmy for its work on "Game of Thrones."
In addition to his work at the studio, he also teaches visual effects for Quebec University in Abitibi-Temiscamingue.