I think it would be totally unfair if I didn't start this acknowledgement by thanking the whole R community, as I believe that a considerable part of my knowledge of R and Shiny was gained from gathering information from forums, blogs, and tutorials. In this sense, if I had to think of someone in particular, I should thank Hadley Wickham not only for his packages, but also for his wonderful tutorials, and from RStudio's Shiny crew, I would like to thank Joe Cheng and Winston Chang for their constant efforts to make the Shiny project grow by answering questions, posting articles, and even sharing their repositories.

I would also like to dedicate this book to my former colleagues at Despegar (http://www.despegar.com/) where I spent over two years of constant learning facing new challenges every day, to my clients who believe in my capabilities every day, and to my former classmates and professors at the University of Buenos Aires.

Of course, I can't leave out my family and friends, who despite not understanding completely what I do for a living, always encouraged me to carry on. Finally, I would like to thank my girlfriend for supporting me in this enriching but tough process of writing a book.