Which architect did Niemeyer collaborate with early in his career?

Oscar Niemeyer collaborated with Le Corbusier early in his career, which significantly influenced his design philosophy and approach to architecture. This collaboration took place while Niemeyer was working on the design of the United Nations building in New York. Le Corbusier, known for his modernist principles, emphasized open spaces and the integration of natural light, ideas that resonated with Niemeyer and shaped his subsequent work.

Niemeyer's exposure to Le Corbusier's techniques and theories allowed him to develop his own unique style, characterized by bold, curvilinear forms and an innovative use of reinforced concrete. This early experience was pivotal in helping Niemeyer create his distinctive architectural language, which later became prominent in his designs for Brasília and other notable projects in Brazil.

The other architects listed, while influential in their own right, did not have the same direct impact on Niemeyer's early development as an architect.