Cisco Systems' chief technology officer Padmasree Warrior is one of the most powerful women in Silicon Valley.She is responsible for around two-thirds of Cisco's revenues, which totaled $43 billion in the most recent fiscal year and, with her colleague Pankaj Patel, oversees more than 22,000 engineers.But Warrior nearly bypassed a career in business altogether -- turned off from the tech industry by the dearth of women in the field, she instead aspired to be part of academia.Read More... More on Women In Tech