Klaas Bosteels is a Co-founder and CEO at Trackuity. They possess expertise in hadoop, machine learning, python, data analysis, scalability and 18 more skills. Colleagues describe them as "I worked with Klaas while he was still a data scientist intern at Last.fm (roughly 2008-2009) and I can strongly recommend Klaas wholeheartedly without hesitation. The first time Klaas impressed me was at a research conference in 2007. He showed me a content-based playlist generator that learned from user feedback to improve the playlists which he had implemented on his tiny MP3 player. (About one year before iTunes Genius was released.) As a data scientist intern at Last.fm he probably had the biggest impact with playground and Dumbo. We used the public playground he built to demonstrate ideas from our research lab. And Dumbo (a Python library) made it a lot easier to work with Hadoop. Both of them made my own work a lot more fun and productive. Both also had a big impact far beyond the research team. In addition, Klaas built various demonstrations and extracted valuable insights from our data which helped inform and guide other projects (e.g. he built the first multi-tag search demonstration we had). I left Last.fm before Klaas joined full time but as one of my role models he still influences me. I admire Klaas for how easily he adapts to new technologies, his patience and curiosity that lets him dive very deeply into the tools he uses, and his consequent mastery of the tools he uses, his modesty, kindness, and productivity." and "Klaas made a big impact at Last.fm and I'm not surprised that he now leads his own data science team. As an intern he wrote the elegant and popular Dumbo package, providing a clean Python interface to Hadoop streaming. We still use it widely today. As a full member of the team he continued to lead improvements in our big data infrastructure, and used his strong background in statistics and his creative flair as an engineer to provide a regular stream of data insights that formed the basis of innovative features and also guided business decisions. As well as being smart and productive, Klaas is sociable and a great communicator, in short he's a huge asset to any organisation."