This book investigates in detail piezoelectric energy harvesting (PEH) technology, assessing its potential us to replace conventional electrochemical batteries with kinetic energy harvesters as sustainable power supplies in wireless sensor network (WSN) devices and mobile electronics, which are originally exposed to ambient vibration. Studies on PEH have attracted engineers and scientists from various disciplines, such as electrical, mechanical, materials, civil and biomedical engineering. Pursuing a holistic approach, the book establishes a fundamental framework for this topic, while emphasizing the importance of integrated analysis and the significant influence of circuit issues in the design and optimization of PEH systems. This approach will help readers from different disciplines recognize the essential aspects of and milestones towards the optimization of PEH systems in practice. The book is intended for undergraduate and graduate students who are interested in energy harvesting technology, researchers investigating kinetic energy harvesting systems, and structure/circuit design engineers working on self-powered WSNs or other energy harvesting applications.