Usereau began working with Société Radio-Canada as a radio journalist in 1996, specializing in sports. He held various positions in radio around Quebec, forging a reputation as one the most knowledgeable baseball commentators in the province. His first field of study was mathematics, which he studied at Université de Sherbrooke from 1982 -1986 before getting a degree in journalism from Laval University. His mathematics background means that he is well-versed in sabermetrics and had been one of the leaders in spreading its concepts in French.
He obtained his current job with RDS in 2011, and has been a commentator on both regular season and postseason broadcasts. He has also been a broadcaster on Olympics telecasts in 2012 and 2016 for sports other than baseball.
Besides his work as a journalist, he has appeared as an actor in a number of movies and television series in Quebec, in small roles. He has won the SABR trivia challenge, held at its annual convention, on a number of occasions, and is the author of a history of the 1980s Montreal Expos.
- Alain Usereau: L'époque glorieuse des Expos, Les Éditeurs Réunis, Sainte-Angèle-de-Monnoir, QC, 2009; translated as The Expos in Their Prime: The Short-Lived Glory of Montreal's Team, 1977-1984, McFarland, Jefferson, NC, 2012. ISBN 978-0786470815