Ellen Siminoff

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Ellen Siminoff (born Milwaukee, Wisconsin) is an entrepreneur and investor. Siminoff was a founding executive and Senior Vice President of Yahoo, where she ran business development, corporate development, and the small business and entertainment business units between 1996 and 2002.[1]

Siminoff is currently Chief Executive Officer of Shmoop, an educational website.[2] She was former Chairman and former CEO of Efficient Frontier.[3] In her 4 years as CEO, Siminoff built Efficient Frontier into the largest buyer of search advertising keywords on Google [4] and one of the 25 most valuable privately held companies in Silicon Valley, at an estimated $275 million valuation, according to Silicon Alley Insider.[5] Efficient Frontier was sold to Adobe for over $400M in 2012.

In 2005, Forbes magazine named her one of their Masters of Information.[6]

Siminoff has been quoted in the New York Times as an Internet industry commentator.[7][8][9][10]

Siminoff obtained a BA in Economics from Princeton University and an MBA from Stanford University.[11]

Siminoff sits on the board of directors for:

and previously in:

She and her husband, David Siminoff, live in Los Altos Hills, California.


  1. ^ "Yahoo! Directors & Officers". Yahoo. Archived from the original on 2013-03-19. 
  2. ^ "Management Team". Shmoop. Retrieved 2013-10-07. 
  3. ^ a b "Board Members". Efficient Frontier. Archived from the original on 2008-07-04. 
  4. ^ "Efficient Frontier: Hacking Madison Avenue". BusinessWeek. 2006-07-23. Retrieved 2013-10-07. 
  5. ^ "23. Efficient Frontier". Business Insider. 2008-03-28. Retrieved 2014-05-05. 
  6. ^ Hardy, Quentin (2005-09-05). "2005 E-Gang: The Keyword Keeper". Forbes.com. Retrieved 2013-10-07. 
  7. ^ Markoff, John (2007-05-05). "Rumors Fly on Microsoft and Yahoo". The New York Times. 
  8. ^ Helft, Miguel (2006-12-07). "Industry Insiders Praise Yahoo Choice for Key Post". The New York Times. 
  9. ^ Helft, Miguel (2008-04-03). "Google Cutting 300 Jobs at DoubleClick". The New York Times. 
  10. ^ Helft, Miguel (2007-02-05). "A Long-Delayed Ad System Has Yahoo Crossing Its Fingers". The New York Times. 
  11. ^ "Q&A with Efficient Frontier's Ellen Siminoff". iMediaConnection.com. Retrieved 2013-10-07. 
  12. ^ "Journal Communications, Inc. Elects Ellen Siminoff to Board of Directors" (Press release). Business Wire. February 14, 2007. 
  13. ^ Siminoff, Ellen F. "Ellen Siminoff: Executive Profile & Biography". BusinessWeek. Retrieved 2013-10-07. 
  14. ^ "Zynga Appoints Ellen Siminoff to Board of Directors". Zynga. 2012-07-19. Archived from the original on 2013-06-24. 
  15. ^ "Mozilla Jobs — Open Positions". Mozilla Corporation. Retrieved 2013-10-07. 
  16. ^ "Three Mozilla Board Members Resign over Choice of New CEO". Digits (The Wall Street Journal). Retrieved 204-03-28.  Check date values in: |access-date= (help)