José Alberto Gutiérrez is known as the “Lord of the Books” to the thousands of book-loving children he’s helped in Bogotá, Colombia.

The garbage collector, featured in an AJ+ video posted Monday, takes discarded books from wealthy neighborhoods and adds them to a makeshift library in his home. The collection of over 20,000 books is open to the kids in the low-income neighborhood where he lives on the weekends.