Dear Diana and Family, While I've already done so through email, I want to send you my deepest sympathies and regrets. Mark was a wonderful collaborator and friend, a trusted colleague through the years. It was my joy to work with him for two decades, and our field is much the poorer at his passing. He will be greatly missed.

Dear Diana, accept my deepest condolences - I pray you find the strength and courage to go through this difficult times. Mark was an amazing human being and will greatly be missed - a kind and gentle soul who will not let a day go by without a smile on his face. Personally it's been an honour and a real privilege for me to know Mark and work under his supervision - I can't speak highly enough of him - he was simply every PGR student's dream supervisor. Rest well, Mark...!!

From 3A in Portsmouth Grammar in 1966, to sharing a tent in an Arctic inter-rail trip, we shared so much of our formative years. Our recent occasional reunions were times to treasure. I am grateful for the privilege of having known Mark, and for the friendship we shared.