Alfred Schutz was a German-American philosopher who lived from 1899 to 1959. He believed that people live in a "world of common-sense" that is shaped by the way they experience and think about the world. He believed that people use a shared language and set of beliefs to understand the world around them. He thought that analyzing this shared language and set of beliefs could help people understand how they see the world and how they interact with it. He wrote a lot of books about his philosophy, which is now known as phenomenology.