The availability of small, low-cost networked sensors combined with advanced signal processing and information extraction is driving a revolution in physiological monitoring and intervention. Body Sensor Networks (BSN) are enabling technologies for precision healthcare, enhanced sports and fitness training, novel life-style monitoring, and individualized security.The 12th International Conference on Wearable and Implantable Body Sensor Networks (BSN 2015) will address BSN research and offer participants a unique forum to discuss the key issues and innovative solutions for sensors, communications, algorithms, systems, and applications. The conference features numerous invited lectures by leading academic researchers and industrial experts. On the days before and after the conference, tutorials will be presented, detailing and demonstrating BSN technologies from sensor them.