I really admired Arren's work as a student, which had a strong influence over me and my life choices. We met a couple of times, but our paths crossed only tangentially. I will always regret not having learned directly from him and not getting to know better the incredible person he was, but I will cherish his influence over my life, even though he might not have even known. Condolences to all the people that were close to him. Stefano