Two renowned contemporary art enthusiasts share their collection with a South Florida museum—and gear up for Art Basel Miami Beach. There’s a large portrait by artist Mickalene Thomas, titled “Portrait of Mama Bush I,” that greets visitors when they walk into the “Belief + Doubt” exhibit...

I sold 90% of my original position in the disruptive video giant way too soon. When you find a growth stock early in its cycle of redefining the market, you hold on. It's been a year and a half since I shared with you my bittersweet tale about...