This quote from Rachel Carson (slightly modified to be more inclusive) speaks to my heart when I think of Mark and his incredibly focused commitment and long-lasting, widespread legacy to youth of all ages: “If children are to keep alive their inborn sense of wonder without any such gift from the fairies, they need the companionship of at least one adult who can share it, rediscovering with them the joy, excitement and mystery of the world we live in.” Thank you Mark, with gratitude to your family for so generously sharing you with so many. We will never forget. Marji DeBuse