HENRY H. LIU, PHD, is a software engineer specializing in developing distributed, high performing, scalable enterprise software products. He is a certified Sun Enterprise Java Architect, IBM XML Developer, and Microsoft .Net Developer. Prior to jumping to computers, as a physicist, he published over 30 research papers in physics while working in the national labs of China, France, Germany, and the United States. His honors include being the author of the highly acclaimed Software Performance and Scalability: A Quantitative Approach (Wiley, 2009), an Alexander von Humboldt Research Fellow in Germany, and a CMG 2004 Best Paper Award recipient for applying queuing theory to analyzing software performance. He is particularly encouraged that nearly 1000 universities/colleges world-wide have been using his works in teaching software technologies to their CS students.