Oh no! I met Dan during my time first working on DNS in 2008. He came to many of us with the cache poisoning bug he discovered and pulled us together to address

Oh no! I met Dan during my time first working on DNS in 2008. He came to many of us with the cache poisoning bug he discovered and pulled us together to address the vulnerabilities before it became public. I remember thinking thank god this guy is using his powers for good, because the damage he could easily do would be significant. After that I ran into him numerous times over the years, at conferences and airports (we seemed to always be leaving or arriving from different places at the same time), and he was always so kind, interesting and interested. I feel lucky to have known him. The works is a sadder, emptier place today.