The UIUC Smalltalk group is located at the Department of Computer Science at the University of Illinois in Urbana-Champaign. Under the direction of Dr. Ralph Johnson, the members of the UIUC Smalltalk Group have been using Smalltalk since 1985. The official name of the group is now the Software Architecture Group, though we still use Smalltalk and study patterns, and our view of software architecture is dynamic and emergent, like Smalltalk.
Here is an article about why a hot-air balloon is the symbol of Smalltalk.
Here is a picture of us at OOPSLA '95.