Leonard Kleinrock

Leonard Kleinrock
Headshot of Leonard Kleinrock
Born	(1934-06-13) June 13, 1934 (age 89) New York City
Nationality	American
Alma mater	City College of New York, MIT
Known for	Queuing theory, ARPANET, Internet development
Awards	Marconi Prize (1986) Harry H. Goode Memorial Award (1996) National Medal of Science (2007)[1] IEEE Alexander Graham Bell Medal (2012) BBVA Foundation Frontiers of Knowledge Award (2014)
Scientific career
Fields	Engineering Computer science
Institutions	UCLA
Thesis	Message delay in communication nets with storage  (1963)
Doctoral advisor	Edward Arthurs[2] Claude Shannon
Doctoral students	Chris Ferguson

Leonard Kleinrock (born June 13, 1934) 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.

In the early 1960s, Kleinrock pioneered the application of queueing theory to model delays in message switching networks in his Ph.D. thesis, published as a book in 1964. In the late 1960s and 1970s, he played an influential role in the development of the ARPANET. In the 1970s, he applied queueing theory to model and measure the performance of packet switching networks and published several of the standard works on the subject. He supervised graduate students who worked on the communication protocols for the ARPANET including students whose later work on internetworking and the Internet protocol suite led to the networking technology employed in 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.

Kleinrock made several important contributions to the field of computer science, in particular to the theoretical foundations of data communication in computer networking. He has received numerous prestigious awards.