Kyle McEntee wasn’t trying to take on the legal establishment when he first filled an Excel spreadsheet with data about how law school graduates fared in the job market. He just wanted a way to decide where to pursue his legal education.

But four years later, McEntee’s project has snowballed into an obsession that has made him a leading voice warning of a legal education bubble in which law students pay an average of about $200,000 for schooling before struggling to find a scarce law firm job to pay off their loans.