He has visited schools on four continents and more than twenty countries as a volunteer or an invited speaker/lecturer. Tucker was a teacher on a military base in Korea on 9/11. His memoir titled The Day Before 9/11 was released in March 2013. The Day Before 9/11 is a harrowing true story that spans America's first decade in the war on terror, and portrays in riveting detail the sacrifices made by military families serving overseas and the enduring pain that accompanies the tragic loss of life.