Bruce Schneier is a well-known American cryptographer, computer security expert, and author. He has written several influential books and articles on security, privacy, and technology. His work often focuses on the importance of understanding risks and the implications of security measures in everyday life. Schneier is also the founder of Schneier on Security, a popular blog where he discusses various topics related to cybersecurity and public policy. He has contributed to the development of several cryptographic algorithms and is a frequent speaker at conferences, sharing insights on how to navigate the complexities of modern security challenges.