Leo Herrera is a studio engineer for Nine Inch Nails, and has worked on various releases including Broken, The Downward Spiral, And All That Could Have Been and Still. During the Fragility period, photos of Leo were frequently posted on nin.com, showing him pursuing his various interests including picking fights with kangaroos, and checking out porno theaters. However, in recent years he has been replaced in his position as Trent's bitch by Dancing Brett.
But as of July 25,2008 Leo has gone back to touring with NIN.
He can be seen in a hotel with Trent on Closure recording parts of the Natural Born Killers soundtrack, especially an edit of Something I Can Never Have.
He has also engineered for industrial rock artist Ricky Martin.