He is also a certified speech-language pathologist in Ontario and Quebec. He pursued his doctoral studies at the Ste-Justine Research Centre as a CIHR Strategic Training Fellow in CCHCSP from 2003 to 2007. He started his academic career as a professor in the School of Rehabilitation Sciences at the University of Ottawa in 2007 before moving to Sudbury in 2015. Professor Lefebvre is conducting research on language and literacy development in children. His focus is on French-speaking children and on children with speech-sound disorders. He is also involved in the knowledge translation and implementation of preventative practices in schools.