Ketsia Lessard was born and raised in Montreal, Quebec and graduated from the University of Quebec with a creative writing degree. She wrote Nelson's Sabbath during a depressive episode, and her characters' reflections are a verbalization of her anguish, her struggle to make sense of life's hardships and recover. The subject matter is heavily researched, including retired RCMP officers' testimonies, PTSD victims' experiences, and the Missing 411 phenomenon.
Ketsia Lessard is also a painter and a church musician.