Dave Smith is a professional engineer developing hardware and software for mobile and embedded platforms. Dave's engineering efforts are currently focused full-time on Android and iOS development. Since 2009, Dave has worked on developing at all levels of the Android platform, from writing user applications using the software development kit, to building and customizing the Android source code. Dave regularly communicates via his development blog (http://blog.wiresareobsolete.com) and Twitter stream @devunwired.
Jeff Friesen is a freelance tutor and software developer with an emphasis on Java (and now Android). In addition to authoring Learn Java for Android Development and co-authoring Android Recipes -- Jeff has written numerous articles on Java and other technologies for JavaWorld (a href="http://www.JavaWorld.com"JavaWorld.com/a), informIT (a href="http://www.InformIT.com"InformIT.com/a), a href="http://www.java.net"Java.net/a, and DevSource (a href="http://www.DevSource.com"DevSource.com/a). Jeff can be contacted via his website at a href="http://www.tutortutor.ca"TutorTutor.ca/a.