Ravi is a project manager in HVAC design based in Pune, India. He is currently involved in the project management and design of the installation and commissioning of a heating system for Russia. Before this he has managed the design and construction of various boiler plants and the associated peripheral systems throughout the world. He takes great delight in getting involved in the actual commissioning process and handing over the systems to the clients. This involves a degree of training and this precipitated the writing of this book on hydraulics. Andries cut his teeth while working for Atlas Aircraft Corporation as a hydraulics specialist over 25 years ago. Since then he has devoted his career to lecturing on the topics of Hydraulics and Fluid Mechanics both at a trades, college and University level. In between his lecturing he has acted as a consultant to numerous blue chip companies on the topic of hydraulics systems. He is currently completing his Masters in Technology (in Design). For relaxation, Andries enjoys flying and working on his farm when he has time. An enthusiastic and knowledgeable instructor he has received superb reviews from his courses on Hydraulics over the past 25 years.