Burrhus Frederic Skinner invented the operant conditioning chamber, innovated his own philosophy of science called Radical Behaviorism and founded his own school of experimental research psychology—the experimental analysis of behavior. Skinner also invented the cumulative recorder to measure rate of responding as part of his highly influential work on schedules of reinforcement.

B. F. Skinner ( Wikipedia )
http://en.wikipedia.org/wiki/B.F._Ski...