Martin Edward Zweig (July 2, 1942 – February 18, 2013) was an American stock investor, investment adviser, and financial analyst. According to Forbes magazine, he was renowned for his "eccentric and lavish lifestyle" as well as having had the most expensive residence in the United States at the time, atop The Pierre on Fifth avenue in Manhattan. It was listed on the New York City real estate market in 2004 for $70 million and in March 2013 for $125 million.