  On April 22 2015, Murray Marshall was invited by Igor Klep and Victor
Vinnikov to talk in the special session on "Operator Theory, Real Algebraic
Geometry, and Moment Problems" that they co-organised for IWOTA 2015 in
Tbilisi, Georgia, July 6--10. This invitation to an IWOTA edition was
considered by the organisers as long overdue, given Marshall's important
contributions to Real Algebraic Geometry in general, and to the
multi-dimensional Moment Problem in particular. Marshall declined on April 27th
writing: "Dear Victor, Thanks very much for the invitation. I am sorry but I
must decline. The reason is that I don't enjoy traveling as much as I used to.
North America or Europe is about the maximum distance I am willing to dealwith.
I hope you are well. Murray." This response startled us, as Marshall has always
been a grand traveler when it came to mathematics. Our fears were alas
confirmed; Marshall passed away just a few days later. In July, I held a talk
at that session myself on joint work with Marshall, and was asked by the
editors of the proceedings volume to write this mathematical obituary.
