Dr. William Stallings is an American author. He has authored textbooks on computer science topics such as operating systems, computer networks, computer organization, and cryptography. He also maintains a website titled Computer Science Student Resource. He has authored 17 titles, and counting revised editions, a total of over 40 books on various aspects of these subjects. In over 20 years in the field, he has been a technical contributor, technical manager, and an executive with several high-technology firms. Currently he is an independent consultant whose clients have included computer and networking manufacturers and customers, software development firms, and leading-edge government research institutions.