Professor Jeff Kirwan will be the keynote speaker at Marion, Virginia's Arbor Day celebration, on Monday, April 30. In his remarks, Kirwan, a forestry professor and Extension specialist for 4-H and youth forestry in Virginia Tech's College of Natural Resources, will discuss his soon-to-be-released book, Remarkable Trees of Virginia, pay tribute to Marion's "Crying Tree," and recall seeing published images of a girl hugging an oak tree the day after the April 16 tragedy on the campus.