Mark Harrison has been programming in Tcl ever since he heard John Ousterhout speak at the 1990 Usenix conference.* He currently works in the telecommunications industry for DSC Communications Corporation as a senior system architect, where he is Chief Tcl Evangelist.* In addition, he is enrolled in the computer science department at the University of Texas at Dallas.
Michael J. McLennan is a Distinguished Member of Technical Staff at Bell Labs Innovations for Lucent Technologies, where he develops software for Computer-Aided Design (CAD). He has been a Tcl/Tk enthusiast since 1992, writing many extensions and applications. He developed the incr Tcl extension, which adds object-oriented facilities to Tcl/Tk. He has also created several Tcl/Tk training courses.