Sean Liao (PMP@) has been written mobile code for PalmOS, JavaME, Microsoft .NETCF, and BlackBerry, and he also has some Nokia Symbian experience since 2000. In 2009, Sean started iOS programming, and then began Android programming the same year by following the same porting strategy, based on years of hands-on mobile programming experience. Currently, Sean is primarily engaged in creating iOS apps and porting them to Android as a bonus.