I am so saddened to learn of Matt’s death. We first “met” through his comments to my blogs. This then evolved into an active e-mail exchange. I was fortunate enough to have the chance to meet him at an ISPS conference. I both enjoyed and valued our exchanges. He was clearly bright and thoughtful. He was extremely well read and generous in sharing articles with me. He taught me so much. My thoughts go out to his family and friends.