Pavlov, Skinner, and Bandura were influential behaviorist theorists. Pavlov studied classical conditioning in dogs. Skinner researched operant conditioning using rewards and punishments with pigeons. Bandura contributed the social learning theory that behavior is learned through observation and imitation. Behaviorism views learning as changes in observable behavior due to environmental influences like reinforcement and punishment. In the classroom, teachers can apply behaviorist principles using rewards and consequences to shape student behavior.