Kathleen Fox began a career as an air traffic controller in 1974 at Transport Canada control towers in Baie-Comeau, Sept-Iles, Saint-Hubert and Montreal-Dorval and at the Montreal Area Control Centre. She assumed more senior positions with Nav Canada where she served as the director of air traffic control services and vice president of operations. In 2014, she was appointed to a four-year term as chair of the Transportation Safety Board of Canada.