Cecil Costa, also know as Eduardo Campos in Latin countries, is a Euro-Brazilian freelance developer who has been learning about computers since getting his first 286 in 1990. From then on, he kept learning about programming languages, computer architecture, and computer science theory. Learning and teaching are his passions; this is the reason why he worked as a trainer and an author. He has been giving on-site courses for companies such as Ericsson, Roche, TVE (a Spanish television channel), and lots of others. He is also the author of Swift Cookbook First Edition and Swift 2 Blueprints, both by Packt Publishing. He will soon publish an iOS 10 programming video course. Nowadays, Cecil Costa teaches through online platforms, helping people from across the world. In 2008, he founded his own company, Conglomo Limited (http://www.conglomo.es), which offers development and training programs both on-site and online. Throughout his professional career, he has created projects by himself and also worked for different companies from small to big ones, such as IBM, Qualcomm, Spanish Lottery, and Dia%. He develops a variety of computer languages (such as Swift, C++, Java, Objective-C, JavaScript, Python, and so on) in different environments (iOS, Android, Web, Mac OS X, Linux, Unity, and so on), because he thinks that good developers needs to learn all kinds of programming languages to open their mind; only after this will they really understand what development is. Nowadays, Cecil is based in the UK, where he is progressing in his professional career as an iOS developer.