Working with Matt was always a pleasure - always patient, always helpful, happy to give advice and to act as a sounding board to sort the good ideas from the bad. I particularly remember whiteboarding a rather fiddly design to a roomful of colleagues. Matt lingered afterwards and asked whether I'd considered a different approach - it was a significant improvement and it's what we implemented. He didn't take any credit for it, but it's an example of how he quietly helped shape our work beyond his own areas of responsibility. It's great to work with people like that.