- Source of Wealth: Cisco Systems Inc.
- Birth Place: United States of America
- Marital Status: Divorced (Sandy Lerner)
- Full Name: Leonard Bosack
- Nationality: American
- Date of Birth: 1952
- Ethnicity: Caucasian
- Occupation: Entrepreneur
- Education: University of Pennsylvania, Stanford University
American businessman Leonard Bosack is one of the founders of Cisco Systems, a multi-national corporation which specializes in designing and selling communications technology, networking services, and consumer electronics. He co-founded the company with Sandra Lerner, who later became his wife.
For founding Cisco Systems, Bosack was selected as a recipient of Computer Entrepreneur Award. He was influential in the commercialization of LAN (local area network) technology in connecting computers that are geographically disparate through a multiprotocol router system which was yet unknown during that time.
In 1990, Bosack resigned from the company, while his wife was fired by the management. Currently, Bosack serves as the chief executive officer of XKL LLC, a private engineering company that develops and explores optical networks that are used for data communications.