Born in Toulouse, Jaussely studied at the local fine arts school, then to the École des Beaux-Arts in the ateliers of Honoré Daumet and Pierre Esquié.
Jaussely took the Prix de Rome for architecture in 1903, and would eventually run his own atelier at the school.
[1] As a young graduate he was the winner, among five entrants, of the city plan for the expansion of Barcelona.
The Plan Jaussely was officially adopted in 1907 and although never completed, it guided the development of the city for decades.
Jaussely's individual building designs include the 1931 Palais de la Porte Dorée, built for the Paris Paris Colonial Exposition (with fellow architects Albert Laprade and Léon Bazin), and the 1932 headquarters for the La Dépêche du Midi in Toulouse.