Former Wall Street maven Sallie Krawcheck made headlines after being fired as the head of Citi’s wealth management unit in 2008, following jobs as CEO of Smith Barney and Sanford C. Bernstein. She experienced firsthand the challenges of being a female senior executive in the male-dominated financial services industry. Today, Krawcheck wants to empower women as co-founder and CEO of Ellevest, a digital investment firm geared towards the female life experience, taking into account their salary fluctuations, risk preferences and longer lifespans. She also heads a female networking group called Ellevate. Krawcheck joined the  Knowledge at Wharton Show on Sirius XM channel 111 to talk about her new book, “ Own It: The Power of Women at Work .”  An edited transcript of the conversation follows. Knowledge at Wharton : People talk a lot about the gender pay gap, but they might not realize there’s a gender investing gap as well. Sallie Krawcheck : There sure is.…