Jerzy Kuryłowicz was a very smart man who lived a long time ago and studied language. He liked to learn how words work and how people use them to communicate with each other. He was from Poland, which is a country far away from here.
Jerzy was so good at studying language that he became a very famous linguist, which means he was really good at understanding how different languages work. He studied many different languages from all over the world, like Sanskrit, which is an ancient language from India, and Latin, which is a language that people used to speak a long time ago.
Jerzy also made some really important discoveries about how language works. For example, he came up with something called the "principle of contrast," which means that different sounds that people use when they speak have important meanings. This helped people understand how language works and how it can change over time.
Even though Jerzy passed away a long time ago, many people still study his work and use his ideas to help them understand language better. He was a very important person in the world of linguistics, which is all about studying language and how we use it to talk to each other.