David Wechsler
Intelligence as a portrait, not a verdict
The clinical psychologist who built the intelligence tests still used in clinics and schools today.
techniques
Intelligence is a profile, not a single number.
Who they were
David Wechsler, born in Romania and raised in New York, came to believe that a single number could never capture a mind. Working at New York's Bellevue Hospital, he assembled tests that measured distinct strengths — verbal reasoning, memory, the speed of thought — and reported them as a profile rather than one score. His adult and children's scales became the most widely used intelligence measures in the world, and they reshaped how psychologists understand a person's particular blend of abilities.
Famous books
What they left on the shelf
Terms they cared about
Ideas worth knowing
Their techniques
How the work was done
Their big idea
Wechsler Intelligence Scales
David Wechsler measured intelligence as a profile of distinct abilities rather than a single score, testing both verbal reasoning and hands-on, nonverbal skills across adults and children. He believed a person's intellect could only be understood by seeing how its different strengths fit together.
Questions in their spirit
What they’d ask you
Sit with one. Answer online, or in the app.
Carry the idea forward
Wechsler — What they’d ask you
Psipas asks you one small, honest question at a time — and builds the picture from your answers.