Hyman was born in Chelsea, Massachusetts. In his teenage years and later while attending Boston University, he worked as a magician and mentalist, impressing the head of his department (among others) with his palmistry. Hyman at one point believed that 'reading' the lines on a person's palm could provide insights into their nature, but later discovered that the person's reaction to the reading had little to do with the actual lines on the palm. This fascination with why this happened led him to switch from a journalist degree to psychology.