NOBEL Prize-winning psychologist Daniel Kahneman has died at the age of 90.

The pioneer researcher became famous for his groundbreaking theory on the human mind – described in the best-selling book “Thinking, Fast and Slow.”

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The theory argues that humans do not make rational decisions based on self-interest but they often act on instinct.

Alongside his longtime collaborator, Amos Tversky, Kahneman reshaped the field of economics, which mostly assumed that people were “rational actors.”

The pair’s research focused on how much decision-making is shaped by quirks and mental shortcuts that can distort our thoughts in irrational yet predictable ways.

The psychologist’s death was confirmed by Princeton University where the Israeli-American academic worked since 1993.

Former colleague and professor Eldar Shafir said: “Many areas in the social sciences simply have not been the same since he arrived on the scene. He will be greatly missed.”

Kahneman was awarded the Nobel Memorial Prize in Economic Sciences in recognition of his research in the fields of psychology and economics in 2002.

Kahneman was born in Tel Aviv and did his Israeli national service in the 1950.

His partner Barbara Tversky the widow of Amos Tversky confirmed his death to The Associated Press.

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