In pictures: The unsung women of technology

Sure, you've heard of Ada Lovelace and Grace Hopper. But how about Frances Allen, Deborah Estrin or Radia Perlman?

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Erna Schneider Hoover: Telephone switching innovator

Erna Scheider Hoover, who earned a doctorate in philosophy and mathematics from Yale University in 1951, is the inventor of computerized telephone switching methods still in widespread use today. She was working for Bell Labs in 1967 when she observed that a certain number of calls would inundate the call center, causing an overload. Using her knowledge of symbolic logic and feedback, she developed a computerized method to monitor the number of incoming calls at different times and adjust the call center's acceptance rate accordingly.

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In pictures: The unsung women of technology

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