In a rare moment of regret on ABC's Shark Tank, Kevin O'Leary watched a potential goldmine slip through his fingers.

At the ripe old age of 28, Nick O’Leary had been in the wine industry for over a decade, working variously in retail, wholesale, viticulture and winemaking. Two years earlier he had laid the ...

Kevin O'Leary, famously known as "Mr. Wonderful" from Shark Tank, once shared details about his membership in the Chevaliers du Tastevin, an exclusive wine connoisseurs' fraternity, during a ...