Latanya Sweeney

Latanya Sweeney is the person who checks. Her career is built not on prediction or prophecy but on the unglamorous, irreplaceable discipline of taking a system as it has actually been deployed—in the actual world, affecting actual people—and measuring what it does. As a graduate student she demonstrated that a state’s carefully anonymized medical records could be matched back to a sitting governor using nothing but a publicly available voter list and three demographic fields: date of birth, sex, and ZIP code. The demonstration was both elegant and devastating, showing not a flaw in one careless release but a structural feature of data itself—that identity does not reside in any single field that can be deleted but is distributed across combinations of attributes that together form a fingerprint, a concept she formalized as the quasi-identifier. Later, her study “Discrimination in Online Ad Delivery” demonstrated that searches for Black-associated names were significantly more likely to generate advertisements implying an