US psychologist Abraham Maslow’s A Theory of Human Motivation is a classic of psychological research that helped change the field for good. Like many field-changing thinkers, Maslow was not just a talented researcher, he was also a creative thinker - able to see things from a new perspective and show them in a different light. He studied what he called exemplary people such as Albert Einstein, Jane Addams, Eleanor Roosevelt, and Frederick Douglass rather than mentally ill or neurotic people.

American psychologist Abraham H. Maslow (1908-1970) first proposed his "hierarchy of needs" theory in 1943. This theory outlines a classification system of universal human needs that individuals feel driven to fulfill in a prioritized manner, culminating in self-actualization.

As the 20th century drew to a close, the Austrian psychologist Alfred Adler (1870-1937) was perhaps the least known of the prominent figures of his time - in particular Sigmund Freud and Carl Gustav Jung - and yet he continues to be a figure of influence in the 21st century. His school of ‘individual psychology’ involved a holistic approach to the study of the individual, with a key focus on the way each person viewed the world, especially regarding their concerns of inferiority.

When psychologist Scott Barry Kaufman first discovered Maslow's unfinished theory of transcendence, sprinkled throughout a cache of unpublished journals, lectures, and essays, he felt a deep resonance with his own work and life. In this groundbreaking book, Kaufman picks up where Maslow left off, unraveling the mysteries of his unfinished theory, and integrating these ideas with the latest research on attachment, connection, creativity, love, purpose and other building blocks of a life well lived.

Here are three key works by Sigmund Freud which, published in the first decades of the 20th century, underpinned his developing views and had such a dramatic effect on world society. In the uncompromising Three Essays on the Theory of Sexuality (1905), he declared that 'sexual aberrations' are not limited to the insane but exist in 'normal' people to a greater or lesser degree. The three essays are divided between sexual perversions, childhood sexuality and puberty.

Adler, along with Freud and Jung, created an entirely new branch of psychology, namely psychoanalysis. What Life Should Mean to You brings his conclusions to a popular audience. It covers adolescence, feelings of superiority and inferiority, the importance of cooperation, work, friendship, love, and marriage.

Soren Kierkegaard was a Danish theologian, philosopher, poet, social critic, and religious author who is widely considered to be the first existentialist philosopher. He wrote critical texts on organized religion, Christianity, morality, ethics, psychology, and the philosophy of religion, displaying a fondness for metaphor, irony, and parables. Much of his philosophical work deals with the issues of how one lives as a "single individual", giving priority to concrete human reality over abstract thinking and highlighting the importance of personal choice and commitment.

In this best-selling book, one of America's most distinguished psychologists crystallises the great progress that has been made in the development of the techniques and basic philosophy of counselling. Carl Rogers gives a clear exposition of procedures by which individuals who are being counselled may be assisted in achieving for themselves new and more effective personality adjustments. Contemporary psychology derives largely from the experimental laboratory or from Freudian theory. It is preoccupied with minute aspects of animal and human behaviour or with psychopathology.

About 2,500 years ago, Plato wrote a set of dialogues that depict Socrates in conversation. The way Socrates asks questions, and the reasons why, amount to a whole way of thinking. This is the Socratic method - one of humanity’s great achievements. More than a technique, the method is an ethic of patience, inquiry, humility, and doubt. It is an aid to better thinking, and a remedy for bad habits of mind, whether in law, politics, the classroom, or tackling life’s big questions at the kitchen table.

As philosophy professor Taylor Carman explains in his helpful introduction, Edmund Husserl (1859-1938) was the founder of modern phenomenology, one of the most important and influential movements of the 20th century. Ideas, published in 1913 – its full title is Ideas for a Pure Phenomenology and Phenomenological Philosophy – was the key work. It is arguably ‘the most fundamental and comprehensive statement of the fundamental principles of Husserl’s mature philosophy’.

Most of us are unable to develop our capacities for love on the only level that really counts — a love that is compounded of maturity, self-knowledge, and courage. Learning to love, like other arts, demands practice and concentration. Even more than any other art, it demands genuine insight and understanding.

Comprising only 632 Chinese characters, the Heart Sutra is Buddhism in a nutshell. Despite its brevity, this powerful work covers more of the Buddha's teachings than any other scripture. Its influence is more profound and wide-reaching than any other text in Buddhism.

Humans have long thought of their bodies and minds as separate spheres of existence. The body is physical. But the mind is mental; it perceives, remembers, believes, feels, and imagines. Although modern science has largely eliminated this mind-body dualism, people still tend to imagine their minds as separate from their physical being. Even in research, the notion of the "self" as somehow distinct from the rest of the organism persists. Joseph LeDoux argues that we have hit an epistemological wall—that ideas like the self are increasingly barriers to discovery and understanding.

All Life is Problem Solving is a stimulating and provocative selection of Popper's writings on his main preoccupations during the last twenty-five years of his life. This collection illuminates Popper's process of working out key formulations in his theory of science, and indicates his view of the state of the world at the end of the Cold War and after the collapse of communism.

William James was one of the most influential figures in 19th-century American philosophy and psychology. His Pragmatism is a set of lectures that he gave in 1906-07 in answer to the enduring debate between empiricism and rationalism. Shifting between them, he proposed pragmatism as a method, the idea being that the value of any truth is dependent upon its utility–upon its practical and experiential consequences.