Vandad Nahavandipoor has developed software using Cocoa, Cocoa Touch, Assembly and C for many years. He has worked with some of the world's biggest brands, such as Visa, U.S. Bank and HSBC to deliver mobile applications to millions of customers around the world. He has always had a passion for teaching and used to make a living by teaching programming when he was only 17 years of age. In programming, his main focus is optimization and delivering high performance applications to users. His hobbies are playing the guitar, practicing piano and road cycling.