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Leonard Bosack

b. 1952

American businessman, co-founder of Cisco Systems

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About Leonard Bosack

Born 1952. Leonard Bosack is an American entrepreneur and computer scientist, known for Cisco Systems.

Leonard X. Bosack (born 1952) is a co-founder of Cisco Systems, an American-based multinational corporation that designs and sells consumer electronics, networking and communications technology, and services. His net worth is approximately $200 million. He was awarded the Computer Entrepreneur Award in 2009 for co-founding Cisco Systems and pioneering and advancing the commercialization of routing technology and the profound changes this technology enabled in the computer industry. , Bosack was the CEO of XKL LLC, a privately funded engineering company which explores and develops optical networks for data communications.

Background Born in Pennsylvania in 1952 to Polish Catholic family, Bosack graduated from La Salle College High School in 1969. In 1973, Bosack graduated from the University of Pennsylvania School of Engineering and Applied Science, and joined the Digital Equipment Corporation (DEC) as a hardware engineer. In 1979, he was accepted into Stanford University, and began to study computer science. During his time at Stanford, he was credited for becoming a support engineer for a 1981 project to connect all of Stanford's mainframes, minis, LISP machines, and Altos.

His contribution was to work on the network router that allowed the computer network under his management to share data from the Computer Science Lab with the Stanford Graduate School of Business' network. He met his wife Sandra Lerner at Stanford, where she was the manager of the Business School lab, and the couple married in 1980. Together in 1984, they started Cisco in Menlo Park.

Cisco In 1984, Bosack co-founded Cisco Systems with his then partner (and now ex-wife) Sandy Lerner. Their aim was to commercialize the Advanced Gateway Server. The Advanced Gateway Server was a revised version of the Stanford router built by William Yeager and Andy Bechtolsheim. Bosack and Lerner designed and built routers in their house, and experimented using Stanford's network. Initially, Bosack and Lerner went to Stanford with a proposition to start building and selling the routers, but the school refused. It was then that they founded their own company, and named it "Cisco," taken from the name of nearby San Francisco. It is widely reported that Lerner and Bosack designed the first router so that they could connect the incompatible computer systems of the Stanford offices they were working in so that they could send letters to each other. However, this is an untrue legend.

Cisco's product was developed in their garage and was sold beginning in 1986 by word of mouth. In their first month alone, Cisco was able to land contracts worth more than $200,000. The company produced revolutionary technology such as the first multiport router-specific line cards and sophisticated routing protocols, giving them domination over the market-place. Cisco went public in 1990, the same year that Bosack resigned. ) over 1231 kilometers of fiber, which is roughly the distance between Chicago and New York City. Bosack was inspired by his belief that by leveraging the inherent, but often untapped, physics of fiber optic components, data transmission speeds can be increased with devices that use less power, less space and require less cooling. It has also purchased an English manor house, Chawton House, once owned by Jane Austen's brother that has become a research center on 18th and 19th-century women writers.

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Important facts

Born
1952, Philadelphia
Birth century
Nationality
Known for
Cisco Systems
Education
Stanford University, The Wharton School, La Salle College High School, University of Pennsylvania

Family & relationships

Spouse
Sandy Lerner

People in Leonard Bosack's life

Named in this biography and alive at the same time

Contemporaries

People whose lives overlapped Leonard Bosack's

Frequently asked questions

Who is Leonard Bosack?

American businessman, co-founder of Cisco Systems

When was Leonard Bosack born?

Leonard Bosack was born in 1952 in Philadelphia.

What is Leonard Bosack's occupation?

Leonard Bosack is an entrepreneur and computer scientist.

What is Leonard Bosack known for?

Leonard Bosack is known for Cisco Systems.

What nationality is Leonard Bosack?

Leonard Bosack is American.

Sources & further reading

Β· Wikipedia: Leonard Bosack

Β· Wikidata: Q3229666

Β· DBpedia: Leonard Bosack

Cite this page

APA: Biography.guide. (2026). Leonard Bosack. https://biography.guide/leonard-bosack/

MLA: "Leonard Bosack." Biography.guide, https://biography.guide/leonard-bosack/.

Chicago: "Leonard Bosack." Biography.guide. https://biography.guide/leonard-bosack/.

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