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Abraham Elijah Maslow, one of the most remarkable psychologist in the World.

He is noted for his conception of a "hierarchy of human needs". He studied such people as Eleanor Roosevelt, Albert Einstein, Jane Addams, and Frederick Douglass, writing that "the study of crippled, stunted, immature, and unhealthy specimens can yield only a cripple psychology and a cripple philosophy." Maslow also studied the healthiest 1% of the college student population.

Maslow has created a hierarchy of five levels of basic needs. Beyond these needs, higher levels of needs exist. In the levels of the five basic needs, it is said that the person does not feel the second need until the demands of the first have been satisfied, nor the third until the second has been satisfied, and so on.

Hierarchy of needs is often portrayed in the shape of a pyramid, with the largest and lowest levels of needs at the bottom.