Leonard Kleinrock, American computer scientist and engineer
Leonard Kleinrock (born June 13, 1934) is an American computer scientist. A professor at UCLA's Henry Samueli School of Engineering and Applied Science, he made several important contributions to the field of computer science, in particular to the theoretical foundations of data communication in computer networking.

He played an influential role in the development of the ARPANET and supervised many graduate students who worked on the communication protocols for internetworking which led to the Internet.