It is with great sadness that we learnt of the untimely passing of Jonathan Michael Borwein, a seminal figure in the worldwide mathematical community. He will be greatly missed within the Australian mathematical scene and within the Australian optimisation community where his loss will be acutely felt. Jon was a predominate activist in Optimisation research in Australia (and in the world). His council, encouragement and financial support (via CARMA) were instrumental in initiating the plans for the MODU workshop and he was one of our Keynote speakers at MODU, only weeks prior to this unwelcome event. There will be many testaments to Jon's mathematical influence and his extensive contributions to so many fields that will be published in the coming decades.
He had an uncanny ability to see what the next step was and this often involved an eclectic mix of theoretical and computational exploration. His way of working was in itself a template for the future in mathematical research.
His friends and collaborators will continue to remember his frank council, his guidance, enthusiasm and wit. Jon will be greatly missed by all of those who had the gift to share time with him.
We would like to extend our condolences to Jon's family and to his wife Judy for their loss.
David Bailey has set up a memorial page for Jon where stories and memories about Jon can be shared.