Conversation so far:
What were Abraham Maslow's views on Humanistic psychology?
Maslow urged people to acknowledge their basic needs before addressing higher needs and ultimately self-actualization. He wanted to know what constituted positive mental health
What are some higher needs in Abraham Maslow's Hierarchy of needs?
At the top of the pyramid, Need for Self-actualization occurs when individuals reach a state of harmony and understanding because they are engaged in achieving their full potential
Are there any others Maslow considers higher needs besides the need for self-actualization?
Once a person has reached the self-actualization state they focus on themselves and try to build their own image.
Did Maslow define the basic needs in his Hierarchy of needs?
At the bottom of the hierarchy are the Basic needs or Physiological needs of a human being: food, water, sleep, sex, homeostasis, and excretion
Are there any other interesting aspects about Maslow's take on humanistic psychology besides urging people to acknowledge their basic needs before addressing higher needs and ultimately self-actualization, how the need for self-actualization is at the top of his Hierarchy, how when someone has reach self-actualization they can begin building their own image, and how Maslow defined the basic needs or physiological needs of a human being as food, water, sleep, sex, homeostasis, and excretion?
None of his published works included a visual representation of the hierarchy. The pyramidal diagram illustrating the Maslow needs hierarchy may be a psychology textbook publisher's illustrative device.

Question: Around what year was he working on this theory?
Self-contained rewrite: Around what year was Maslow working on his Hierarchy of needs?