For years, Donald Trump’s distinctive, large, and bold signature has captured the public’s attention. Not only did it recently come to light that his signature appeared in a book that Jeffrey Epstein received for his 50th birthday, but it fits neatly alongside Trump’s long history of brash self-adulation. “I love my signature, I really do,” he said in a September 30, 2025, speech to military leaders. “Everyone loves my signature.”

His signature also happens to be of particular interest to me, given my decades-long fascination with, and occasional academic research on, the connection between signature size and personal attributes.

A long-time social psychologist who has studied America’s elite, I made an unintentional empirical discovery as an undergraduate more than 50 years ago. The link that I found then—and that numerous studies have since echoed—is that signature size is related to status and one’s sense of self.

Back in 1967, during my senior year of college, I was a work-study student in Wesleyan University’s psychology library. My task, four nights a week, was to check out books and to reshelve books that had been returned.

When students or faculty took books out, they were asked to sign their names on an orange, unlined card found in each book.

At some point, I noticed a pattern: When faculty signed the books out, they used a lot of space to sign their names. When students checked them out, they used very little space, leaving a lot of space for future readers.

So I decided to study my observation systematically.

I gathered at least 10 signatures for each faculty member and comparison samples of student signatures with the same number of letters in their names. After measuring by multiplying the height versus the width of the amount of........

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