Mark Granovetter

Sociology professor at Stanford.

http://www.stanford.edu/dept/soc/granovet.html

Wrote "The Strength of Weak Ties", profiled by Malcolm Gladwell.

Involved in a Social Network Analysis project on Silicon Valley.

Thanks for the pointer. He has a very good book out, his Ph.D. thesis, called simply "Getting a Job". It talks about how all of the weak ties work in the employment market with lots of examples. --EdwardVielmetti