I have worked with Simon on various projects for as long as I have been at CS. He was a great professional and always there to help out and think of ways to move forwards. I liked that on the one hand he was always serious and reserved, yet there was also room for jokes and laughter. He will be missed and I am sure all people who had the pleasure of working with him over the years will cherish the memories. My thoughts go out to his family and friends.