Claude Chapdelaine began his work on the Saint Lawrence Iroquoians at the early sixteenth-century Mandeville site, near his hometown of Sorel. His extensive work has been at the centre of debates on cultural variability among Iroquoian corn growers, and has also contributed to Saint Lawrence Iroquoian maritime adaptations and their puzzling disappearance at a time when European contact was increasing. His excavations at the late sixteenth-century Royarnois site at Cap-Tourmente and most recently at the Saint-Anicet cluster consolidated cultural timelines and exposed the need for a broader consultation on indicators of contact throughout the Northeast, with special reference to the Saint Lawrence corridor. Extremely active as a researcher with numerous books and articles in his name, at the Université de Montréal, Chapdelaine also led projects on Moche sites in Peru, the important Paleoindian site of Cliche-Rancourt near Lac-Mégantic in Québec, and continues to collaborate with the many students he has trained over the years.