So sorry to hear of Dave's passing and my condolences to his family. Dave was a true expert in his field and dedicated to the pursuit of knowledge for its own sake, not necessarily knowing where his research may lead. An example of the adage 'learn everything about something, and something about everything'. More than that, he was a kind and generous man, acknowledging the contributions and loyalty of others. He was particularly good to me when I first moved to Bristol. I was fortunate to have him as my PhD supervisor (I was his first student), and he helped and guided me throughout my career. A sad day Philip Judson