"Bill Calkins wrote the book! I have a dog eared copy of Inside Solaris, and the System Admin Certification Training Guide. Both are invaluable to the Solaris community. Now imagine learning Unix in person with the author as your instructor. The book comes to life! I have had customers all over the world request Bill Calkins classes. Each and every time the results were the same; amazed, excited, and extremely positive. From consulting large multi-cultural/multi-organizational corporations to one on one mentoring, there is no one better equipped to bring order to the chaos. I highly recommend Bill Calkins for your next project."