Julien holds a Bachelor's degree in Biological Sciences from the Université de Montréal, as well as a Master's degree in Biology from McGill University, focusing on ecosystem stability and connectivity. He worked for nearly 5 years in the Canadian wind power industry in asset management and operations. Through this experience, he worked primarily as a project manager for the maintenance and upkeep of wind power facilities, which enabled him to familiarize himself with a number of issues specific to the life cycle of energy facilities.

At Ouranos since November 2023, he coordinates the energy security adaptation priority.