Muriel ‘Mickie’ Siebert, the first female member of the NYSE Euronext (NYSE:NYX), passed away at the Memorial Sloan-Kettering Cancer Center at the age of 80, People reports. Known as the ‘first lady of finance,’ she became as famous for her philanthropy and public service as for breaking through the glass ceiling that had kept women from running their own brokerages. Muriel Siebert’s carrier history Siebert was born in Cleveland, Ohio in 1932 and started her career on Wall Street with Bache & Co in 1954 as a researcher who eventually specialized in the aerospace industry. She started her own firm,…