Remember when you were worried about going to school for the first time, and your mom or dad helped you feel less scared by talking to you and making you feel better? Well, that's sort of what a psychologist named David Marks does, but he helps grown-ups!
David Marks is somebody who studied how people think and feel. Sometimes, grown-ups might feel sad or anxious or even scared, just like how you might feel when you're worried about going to school. And that's where David comes in. He helps people understand why they might be feeling that way and helps them figure out how to feel better.
He does this by talking with the person and asking them questions, just like how your mom or dad talked to you to help you feel better about going to school. He also might give them special activities or exercises to do that can help them feel less sad or anxious.
David Marks wants to help people be happier and healthier, just like how your mom and dad want you to be happy and healthy. So, he studies how people think and feel and helps them understand themselves better so they can feel better too!