This thesis explores the career of iCanadian landscape architect James Austin Floyd (1910-1981). To date, despite Floyd’s status as one of Canada’s first modern landscape architects, there exists no comprehensive study of his work. Through concentrated literature review, archival study, and key informant interviews, this thesis explores Floyd’s residential and institutional gardens—designed between 1950 and 1970---in the context of the emergence of modern landscape architecture in postwar Canada. The thesis concludes that Floyd had considerable influence on the evolution of modern landscape architecture in Canada through his garden designs and writings, and that his design philosophy, merging functionalism with aesthetic, owed much to his professional training and influences in Canada and the United States. This thesis offers valuable information for further exploration of Canada’s landscape architectural history in the postwar modern era.