Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Peter J. Denning (born 1942) is an American computer scientist, and prolific writer. He is best known for pioneering work in virtual memory, especially for inventing the working-set model for program behavior, which defeated thrashing in operating systems and became the reference standard for all memory management policies. He is also known for his works on principles of operating systems, operational analysis of queueing network systems, design and implementation of CSNET, ACM digital library, codifying the great principles of computing, and most recently for his groundbreaking book The Innovator's Way", on innovation as learnable practices.