Born in 1921 in Austria, Ernst Haas (1921-1986), like Saul Leiter born two years later, became known for his early work with Kodachrome. His photography was strongly graphic, emphasizing colour as a compositional elements and often using motion and reflections. Haas was a member of Magnum and a colleague of contemporaries Robert Capa and Henri Cartier Bresson.
You can see his work and find out more on the website of the Ernst Haas Estate. Take some time to look through his work. Study the composition. Then poke around the website, Philosophy By Haas is a particularly good read, as are the Reflections on Haas.
If you can find them, Haas wrote 4 books, all of them now out of print: The Creation (1971), In America (1975), In Germany (1976), and Himalayan Pilgrimage (1978). Posthumously, his work is in Ernst Haas, Color Photography (1989), Ernst Haas in Black and White (1992), and Color Correction (2011).