James Samuel Coleman was a really smart man who liked to study people and the groups they belong to. He looked at things like schools, neighborhoods, and families, and tried to figure out how they affect how well people do in life. He even wrote a really famous report about all the things that can help or hurt how well students do in school.
Basically, he was really curious about how people can have different opportunities and challenges in life depending on things outside of their control. And he wanted to figure out how we can make things more fair and equal for everyone.