From the dark ages where people were treated inhumanely to today, in this century where mental health is taken care of and those with mental health issues are treated on an equal footing. All the discoveries and reforms that followed have led us to some of the most important names in the psychological field today, such as Sigmund Freud, Carl Jung, Alfred Adler, Wilhelm Wundt, B.F. Skinner, Pavlov, Watson, and EL Thorndike. The past has paved the way for greater acceptance of abnormal psychology today and has made it easier to care for people with mental disorders. Reviewed, from the Greeks to contemporary contributors to modern psychology, everyone had their place in the timeline of creating a better world, more humane treatment of the mentally ill, and shedding better light on mental health.