Leonard Kleinrock

Leonard Kleinrock (born 1934) is an American computer scientist known for his pioneering work on packet switching theory, which laid the foundation for the development of the Internet. He played a key role in the creation of ARPANET, the precursor to the Internet, and is considered one of the fathers of the Internet.

Pioneered the application of queueing theory to model delays in message switching networks in his Ph.D. thesis in 1961–1962, published as a book in 1964. He later published several of the standard works on the subject. In the early 1970s, he applied queueing theory to model the performance of packet switching networks. This work played an influential role in the development of the ARPANET, the precursor to the Internet. He supervised many graduate students who worked on the communication protocols for internetworking which led to the Internet. His theoretical work on hierarchical routing in the late 1970s with student Farouk Kamoun remains critical to the operation of the Internet today.

Leonard Kleinrock is an American computer scientist and Internet pioneer. He is Distinguished Professor Emeritus of Computer Science at UCLA's Henry Samueli School of Engineering and Applied Science. Kleinrock made several important contributions to the field of computer science, in particular to the mathematical foundations of data communication in computer networking. He has received numerous prestigious awards.

• Leonard Kleinrock (born June 13, 1934) is an American computer scientist and Internet pioneer.