Louis Isadore Kahn was a 20th century American architect, educator, and philosopher. Some key aspects of his work include redefining architecture through structure, form, space and light. He is known for his use of geometric shapes, solid materials like brick and concrete, and intentional use of natural light. Two important projects he designed were the Indian Institute of Management in Ahmedabad, characterized by its diagonal layout and use of local brick, and the Salk Institute characterized by its two symmetrical buildings separated by a courtyard and stream.