I find it hard to believe how losing a person that I’ve known for just a few years could leave such a hole inside me. In the last days, I’ve said many times: “Arren was more than just…”, more than just a supervisor, more than just a mentor, more than just a role model. In the end, I am left thinking that he was more than just a man. Because Arren always lived his life at 200%, putting all his energies in everything he was doing. I always made fun of him because he claimed he’d need at least 10+ hours of sleep to face his day, but they were more than deserved. Arren was not someone who would make compromises with himself and has been always honest with anyone. If he needed something or had to tell a hard truth, he would tell you straight in your face, with no hesitation. Nevertheless, he always had words of comfort when I failed, and appreciation when I succeeded. With his frenetic attitude, he would push the others around him to go further and aim higher. He was always ready to fight for us, even when not required to, even when the opponent would be ourselves. On top of the personal grievance, there is the oppressive fact that humankind has lost a great mind. The flexibility, sharpness, and clearness of his thoughts will always be inspirational. Arren once said that he began the scientific career because he had a problem solving-oriented mind. I feel very grateful that he decided to commit it to science. Arren, you leave behind a lot of people who admired you and loved you. The same people that inherited your way of thinking and understanding metabolism. Hopefully, we will be capable of bringing your teachings with us on the path ahead. Rest in peace Arren. Whatever place you are now, I am sure you’re making it better. Alberto De Maria