Frank Vasquez is an independent software consultant specializing in consumer electronics. He has more than a decade of experience designing and building embedded Linux systems. During that time, he has shipped numerous products including a rackmount DSP audio server, a diver-held sonar camcorder, an IoT hotspot, a home battery, and a grid-scale energy storage system. Since the third edition of this book was published, Frank has also become a frequent speaker at open source software conferences including the Yocto Project Summit, Embedded Linux Conference, FOSDEM, and All Systems Go! He is passionate about learning new technologies and teaching them to others.

Chris Simmonds is a software consultant and trainer living in southern England. He has almost two decades of experience in designing and building open-source embedded systems. He is the founder and chief consultant at 2net Ltd, which provides professional training and mentoring services in embedded Linux, Linux device drivers, and Android platform development. He has trained engineers at many of the biggest companies in the embedded world, including ARM, Qualcomm, Intel, Ericsson, and General Dynamics. He is a frequent presenter at open source and embedded conferences, including the Embedded Linux Conference and Embedded World.