Hello Tim, I am deeply saddened by Ronnie's death. I recall that Ronnie played a central role in organizing over many years the Bangor-Bielefeld Seminar which brought together mathematicians from Europe as well as South America, Asia, and Australia to share results in topology, homotopy theory , homological algebra, algebra ,and K-theory, using a blend of ideas and methods from category theory and all of the above areas. He will certainly be missed. Please give my condolences to his family. Tony On Sat, Dec 7, 2024 at 7:32 PM Timothy Porter <t.porter.maths@gmail.com<mailto:t.porter.maths@gmail.com>> wrote: I have been asked by his son Marcus to inform his friends on the Categories mailing list that Ronnie Brown who was for many years professor at the University College of North Wales (later renamed the University of Bangor) died yesterday at his home in Deganwy. Please share this information with others who may have known Ronnie. Thanks, Tim Porter. You're receiving this message because you're a member of the Categories mailing list group from Macquarie University. To take part in this conversation, reply all to this message. View group files | Leave group | Learn more about Microsoft 365 Groups You're receiving this message because you're a member of the Categories mailing list group from Macquarie University. To take part in this conversation, reply all to this message. View group files<https://outlook.office365.com/owa/categories@mq.edu.au/groupsubscription.ashx?source=EscalatedMessage&action=files&GuestId=6bf90c14-94d1-45b7-a0b5-9dd447734d27> | Leave group<https://outlook.office365.com/owa/categories@mq.edu.au/groupsubscription.ashx?source=EscalatedMessage&action=leave&GuestId=6bf90c14-94d1-45b7-a0b5-9dd447734d27> | Learn more about Microsoft 365 Groups<https://aka.ms/o365g>