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...!!