George Eman Vaillant is a very smart person who studies how people grow and change over the course of their lives. He looks at things like how we feel about ourselves and other people, and how our brains work.
Think of it like growing a plant. The plant goes through different stages as it grows, just like people go through different stages as they grow up. Vaillant is interested in what happens during each stage and how it affects how we turn out as adults.
He also looks at things like happiness and what makes people feel happy in their lives. It's kind of like looking at a recipe and trying to figure out what ingredients make a dish taste good. Vaillant tries to understand what factors contribute to people feeling happy and successful in their lives.
In summary, George Eman Vaillant is a scientist who studies how people grow and change throughout their lives and what factors contribute to happiness and success.