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Charles Darwin publishes his book "On the Origin of the Species" about evolution and natural selection http://www.biography.com/people/charles-darwin-9266433#awesm=~oGCUa5tMKzpUGu
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Charles Horton Cooley publishes Human Nature and the Social Order using the term "the looking glass self" for the first time http://www.popularsocialscience.com/2013/05/27/the-looking-glass-self-how-our-self-image-is-shaped-by-society/
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George Herbert Mead of the Chicago school influences the development of the symbolic interaction theory which states that actions are based on the meanings people attribute to the behavior http://sociology.about.com/od/Sociological-Theory/a/Symbolic-Interaction-Theory.htm
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Sigmund Freud develops his psychoanalytic theory involving the id, the ego, and the superego http://www.muskingum.edu/~psych/psycweb/history/freud.htm
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Piaget states that children go through four stages of development that will shape them for their entire adult life http://www.webmd.com/children/piaget-stages-of-development
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B.F. Skinner coins operant conditioning and the idea of positive reward and negitive feedback based on previous work by Thorndike http://www.simplypsychology.org/operant-conditioning.html
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Rotter publishes his book entitled Social Learning and Clinical Psychology. This book tied together social learning theory and personality theory http://psych.fullerton.edu/jmearns/rotter.htm
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Carl Rogers builds upon the previous theories of Abraham Maslow to state that humans have one central motive - to self-actualize "The organism has one basic tendency and striving - to actualize, maintain, and enhance the experiencing organism" http://www.simplypsychology.org/carl-rogers.html
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Kohlberg develops his theory on moral development based on Piaget's stages of development http://faculty.plts.edu/gpence/html/kohlberg.htm
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Albert Bandura states that behavior is learned from the environment through observational learning based on his famous Bobo Doll experiment http://www.simplypsychology.org/bobo-doll.html http://www.simplypsychology.org/bandura.html
