 In 1985, Krol began working at the National Center for Supercomputing Applications (NCSA).He was the network manager for the NCSA when the contract was received to establish the NSFNet, and led the team in the network development.He helped develop the Frequently Asked Questions format when he published the popular user's guide "Hitchhiker's Guide to the Internet" in 1987, which was funded by the National Science Foundation.