William, I am so sorry to learn about the passing away of David Swensen. I had reached out to him sometime ago to ask about a question I had related to how he applied the efficient frontier to portfolio optimization of the endowment fund and he was so kind to respond with an insight that inspired me to continue down a certain path on an optimization problem I was trying to resolve. Truly a great and down-to-earth person. My sincere condolences to all of his family, friends and colleagues at Yale. And thanks for sharing this news.