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Jean William Fritz Piaget (UK: / p i ˈ æ ʒ eɪ /, [1] [2] US: / ˌ p iː ə ˈ ʒ eɪ, p j ɑː ˈ ʒ eɪ /; [3] [4] [5] French: [ʒɑ̃ pjaʒɛ]; 9 August 1896 – 16 September 1980) was a Swiss psychologist known for his work on child development.