How Retired Wall Street Trader Helped Spark Protests

Robert S. Halper, a retired Wall Street trader, spends time each day in Zuccotti Park talking to protesters about politics and their thoughts on reforming the banking system. But Mr. Halper, a 52-year-old Brooklyn native, never reveals two facts about himself: he is a former vice chairman of the New York Mercantile Exchange and the largest single donor to the nonprofit magazine that ignited the Occupy Wall Street movement.