Louis Bernard Bonnier was a French architect known for his work as an urban planner for the city of Paris. He was instrumental in loosening the restrictions on the appearance of buildings in Paris, which resulted in the blossoming of Art Nouveau buildings. He designed many significant buildings himself, including private villas, public housing and railway buildings. In all his work he was true to the rationalist principles of Art Nouveau.

Marcel César Poëte was a French librarian, historian and urban planning theoretician. He was a co-founder of the School of Advanced Urban Studies, where he taught, and was highly influential in developing new theories of urban planning in Paris in the first half of the 20th century.