Jef Raskin was a really smart man who helped create the first Apple Macintosh computer. He was like a coach for the team of people who were working to make the computer. He thought it was important to make computers easy for everyone to use, not just for really smart people.
Raskin also believed that it was important to think about how people would actually use the computer. He wanted to make sure they could do everything they needed to do without getting frustrated or confused.
He was a bit like a teacher, trying to explain things in a way that people could understand. He even wrote a book called "The Humane Interface" to help people use technology in a more natural and easy way.
People who used computers today might not know who Jef Raskin was, but they can thank him for making their technology easy and user-friendly!