In Wireless Sensor Networks, no. of significant challenges are imposed on MAC Protocol Design for energy efficiency with node mobility. Various MAC Protocols with different objectives were designed to provide reliable communication with good data rates & low energy consumption. Some MAC protocols proposed for static sensor nodes degrades network performance in mobile networks.In this book, we implemented an adaptive mobility aware & energy efficient medium access protocol (MEMAC) for mobile wireless sensors network. MEMAC protocol is hybrid based MAC protocol which has the advantages of energy efficiency in mobile environment.