"Len" Shustek is a founder of networking companies Nestar Systems and Network General and a former chairman of the board of trustees of the Computer History Museum located in Mountain View, California.

After leaving the faculty, he co-founded Nestar Systems in 1979,[3][4] and Network General in 1986.

[5][6] In 2003, he provided a $2.5 million endowment for the "Leonard J. Shustek Distinguished Professor of Computer Science Chair" at Polytechnic Institute of New York University.

[8] In 1972, Shustek proposed using microcode for evaluating the performance of computer systems.

Saal then convinced Shustek to give up his position as an associate professor at Carnegie Mellon, and together they founded the networking company Nestar.