David Lewis (philosopher)

David Lewis was a philosopher who lived from 1941 to 2001. He worked on a lot of ideas and theories in philosophy, which means he thought long and hard about why things happen and the ways the world works. He made a lot of interesting ideas about the relationships between different events and causes and effects. He wrote books, gave lectures, and even had a special kind of philosophy (called 'modal realism') named after him. In a nutshell, he thought a lot about how things come to be the way they are and how different parts of reality are connected.