Truesdale holds dual United States and Canadian citizenship. He stumbled into acting at the age of seventeen when he decided on a whim to audition for acting school. He was accepted and soon discovered his passion for acting. He studied at the National Theatre School of Canada before he began his television acting career in the long-running Canadian series He Shoots, He Scores. He was nominated for a Gemini Award for his role on the Québécois sitcom Roommates. He also starred in another Québécois French-language series on the SRC channel called Majeur et vacciné. He was part of the Gilmore Girls cast from 2001 to 2007, and he returned for the 2016 revival of the series.
In 2011, Yanic moved back to his home city Montreal where he opened a spin studio called SpinEnergie, inspired by LA's dance style spin classes. He can also be seen in the film See Jane Date.