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Milen Chechev is an accomplished data science professional with extensive experience in academia and industry. Currently serving as the Head of Data Science at Fourth since May 2021, Milen has also been a lecturer at Sofia University since October 2014, specializing in Machine Learning, Recommendation Systems, and Data Structures and Algorithms. Prior roles include Machine Learning Lead at Ocado Technology, where Milen oversaw ML research on Bot Failure Prediction, and Data Science Lead at Adcash® Advertising Technology, leading projects in online advertising. Previous positions include Software Development Engineer at Amazon and Assistant Professor at Sofia University. Milen holds a PhD in Recommender Systems and Social Networks from Sofia University, alongside advanced degrees in Artificial Intelligence and Machine Learning.