The author of a sassy blog about the federal judiciary, “Underneath Their Robes,” is no longer cloaked in mystery, and it turns out it’s a federal prosecutor.

The writer of the Web log, which had humorous references to judges as “hotties” and “babes,” purported to be a young, female lawyer who worked in San Francisco. But in an interview with The New Yorker magazine published this week the author identified himself as Assistant U.S. Attorney David Lat of Newark, N.J.