Darren Cook has over 20 years of experience as a software developer, data analyst, and technical director, working on everything from financial trading systems to NLP, data visualization tools, and PR websites for some of the world's largest brands. He is skilled in a wide range of computer languages, including R, C++, PHP, JavaScript, and Python. He has written two books for O'Reilly, including the H2O book, and works at QQ Trend, a data analysis and data products company.