Please welcome Dr. Roger Sorensen to the Chat. Roger has always been fascinated by the brain, constantly wondering how it works and how it makes you become a person who is different from your sister or best friend. He was trained in neurochemistry, and at work, he spends his time thinking about how drugs of abuse change brain function and a person’s behavior. When not at work, he spends his time riding his bicycle or practicing guitar and piano. He expects that someday scientists will be able to determine how this complex organ known as the brain makes us think, feel, and be who we are.