Muriel Siebert stands on the trading floor of her discount brokerage and underwriting firm in New York on May 9,1995. Siebert died Saturday in New York. She was 80. Wyatt Counts/AP hide caption itoggle caption Wyatt Counts/AP The Two-Way First Female Member Of New York Stock Exchange Dies August 25, 2013 Muriel "Mickie" Siebert bought a seat on the exchange in 1967 and was also the first woman to head one of its member firms. She died Saturday in New York at age 80. The cause was complications of cancer.