Ivan Petrovich Pavlov was born on September 14,1849. He was a Russian physiologist who studied medicine and general science at the University of St.Petersburg and the Military of Medicine Academy. He did many experiments involving conditioning. In the experiment he got a dog and taught the dog how to come by the ring of a bell. Pavlov was known for his contribution of classical conditioning in the field of psychology.He first started by learning the digestive patterns of the dogs.He build a device that would measure the amount of saliva the dogs would have. Pavlov noticed that they would salivate every time food was brought to them. He called the salivation a reflex response since it was a normal reaction. He discovered that the dog’s saliva was a normal response to the food. He called the food the unconditioned stimulus. He started pairing cues before showing the dogs the food. Pavlov then thought that much of human behavior was based on conditioning. He thought that people could be taught a better way to live if behavior was modified. He is also famous for his work and animal experiment about classical conditioning.Ivan Petrovich Pavlov died in the year 1963. Alfred Adler was a physician, psychotherapist, and the founder of Adlerian psychology. He was born February 7, 1870. Adler studied at the University of Vienna. He began his career as an opthamologist. Adler work stressed the importance of nurturing feelings, belonging and striving for superiority. He was considered the first community psychologist because his work brought attention to community life, prevention and population health.Alfred theory was that he examined personality around the same time as Carl Jung and some others .They worked on some theories together until he rejected that sex was an emphasis. He thought that personality difficulties come from a feeling of feeling less than others coming from restrictions on a person’s need for self confidence. Adler therapy is a psychoeducational approach that is both humanistic and goal oriented, it emphasizes that the person striving for success and trying to connect with others and contributions to society are hallmarks of mental health. Carl Jung was a Swiss Psychiatrist and founder of the school of analytical psychology. He proposed and developed the idea of an extroverted and introverted personality and so on. He is best known for his theories of the collective unconscious which includes the concept of archetypes ,and the use of synchronicity in psychotherapy. Carl Jung is recognized as one of the most influential psychiatrists of all time. Some stuff that he did is the collective unconscious, dream analysis and the way symbols from the collective unconscious show up in dreams. Carl believes in the existence of the unconscious according to him dreams are a way of communicating and acquainting yourself with the unconscious.