Sherman Alpert has been designing and programming advanced technology applications in Smalltalk since 1987 at IBM's T. J. Watson Research Center.
Kyle Brown is currently an Executive Java Consultant with IBM WebSphere Services.
Bobby Woolf is coauthor of The Design Patterns Smalltalk Companion (Addison-Wesley, 1998), and author of articles in IBM DeveloperWorks, Java Developer's Journal, and elsewhere. He has been a tutorial presenter at OOPSLA, JavaEdge, and Smalltalk Solutions, among other conferences.