Tull therefore invited Dunn, Grossman and Luskin over to lunch at Morgan Stanley's opulent dining room to explain how they wanted to launch a series of exchange-traded index funds that tracked international stockmarkets. SPDR was hardly a roaring success, but Luskin seemed particularly keen on the idea. Luskin, a college dropout turned options trader, was unusually abrasive for BGI, a company that was dominated mostly by clean-cut soft-spoken former academics like Grossman, who would debate and analyze everything to death.