The completion of this book would not have been possible without the contribution of many individuals, to whom we express our appreciation and gratitude. Without their help the book might never have become a reality. First of all, we thank all the prestigious authors who accepted our offer to be part of this book. We are very grateful for their praiseworthy work and for the professionalism and seriousness they demonstrated during the preparation of this book. In particular, we thank Giuseppe Carenini, Erik Cambria, Stephen Pulman, Paolo Rosso, Delia Irazú Hernández Faria, Huayi Li, Sapna Negi, Carlos A. Iglesias, Viviana Patti, Malvina Nissim, Stefano Scamuzzo, Fabrizia Mantovani, Bradley Honan, Luca Dini, Karo Moilanen, Paul Parau, Paul Buitelaar, J. Fernando Sánchez-Rada, Gabi Vulcu, Letizia Pernigotti, Isabella Iennaco, Pietro Cipresso, Federica Pallavicini, Derek Richer, Gabriel Murray, Enamul Hoque, Geli Fei, Miquel Montaner, André Bittar, Cécile Robin, Frédérique Segond, Camelia Lemnaru, Mihaela Dinsoreanu, Rodica Potolea, Federica Bisio, and Luca Oneto.

We also express our gratitude to the companies which agreed to provide important contributions and to write about their good practices. On the publication side, it was a pleasure working with the helpful staff of Morgan Kaufmann, an imprint of Elsevier. We thank our editorial project manager, Amy Invernizzi, who has been very helpful for the success of this book. It has been a wonderful experience working with her. Finally, we thank all researchers, scientists and industries operating in this field for their important contributions in the literature regarding sentiment analysis.