Eric Berne was a Canadian-American psychiatrist who developed Transactional Analysis in the 1950s. He wrote the influential book "Games People Play" and proposed that human behavior can be understood through analyzing transactions between people on structural, transactional, game, and script levels. A core goal of Transactional Analysis is helping people identify and move away from destructive patterns established in their childhood. Berne introduced concepts like ego states, life positions, and games that have influenced theories of personality and psychotherapy.