xv ' really like to thank all my coworkers in my companyespecially mo and arnofor all the adventures we have been through together mo and arno have provided me excellent support and advice appreciate all of their time and effort in making this book complete they are great peopleand without themthis book may not have been written finallya sincere thank you to my friends who support me and understand that do not have much time but still count on the love and support they have given me throughout my career and the development of this book davy cielen would like to give thanks to my family and friends who have supported me all the way through the process of writing this book it has not always been easy to stay at home writingwhile could be out discovering new things want to give very special thanks to my parentsmy brother jagoand my girlfriend delphine for always being there for meregardless of what crazy plans come up with and execute would also like to thank my godmotherand my godfather whose current struggle with cancer puts everything in life into perspective again thanks also go to my friends for buying me beer to distract me from my work and to delphine' parentsher brother kareland his soon-to-be wife tess for their hospitality (and for stuffing me with good foodall of them have made great contribution to wonderful life so far last but not leasti would like to thank my coauthor momy erc-homieand my coauthor davy for their insightful contributions to this book share the ups and downs of being an entrepreneur and data scientist with both of them on daily basis it has been great trip so far let' hope there are many more days to come arno meysman first and foremosti would like to thank my fiancee muhuba for her loveunderstandingcaringand patience finallyi owe much to davy and arno for having fun and for making an entrepreneurial dream come true their unfailing dedication has been vital resource for the realization of this book mohamed ali