I’m so saddened to hear of the passing of Michael Rabin this morning. Michael was a father of modern cryptography, a true legend. And I was fortunate to be able to call him my teacher. If you’re reading this post or did anything else on the internet today, you’ve most definitely used technology that he pioneered. When I had the privilege to study under Michael, he was already over 80 years old. But I’ve never had a more energetic teacher, someone who was so passionate not only about understanding the universe, but about sharing that knowledge with the next generation. The world lost a giant today. May his memory be a blessing.