Psychologists study the human mind and human behavior and help people with mental and emotional problems. Some specialize in research, while others focus on assisting companies and groups in managing conflict and operating more effectively. But most serve as clinical psychologists and work in counseling centers, hospitals, and independent or group practices. Over 40 percent of all psychologists are self-employed, a rate five times higher than for most other professions. The educational requirements are high. A doctoral degree and a state license are required for many positions. The work can be emotionally draining. But whether it’s helping people kick a drug habit, come to terms with the loss of a loved one, or cope with chronic pain or illness, knowing you’ve made a positive difference in someone’s life can be very, very fulfilling.