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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.
Siminoff is currently Chief Executive Officer of Shmoop, an educational website. She was former Chairman and former CEO of Efficient Frontier. In her 4 years as CEO, Siminoff built Efficient Frontier into the largest buyer of search advertising keywords on Google  and one of the 25 most valuable privately held companies in Silicon Valley, at an estimated $275 million valuation, according to Silicon Alley Insider. Efficient Frontier was sold to Adobe for over $400 MM in 2012.
Siminoff sits on the board of directors for:
- Mozilla Corporation 
- Efficient Frontier 
- Journal Communications 
- US Auto Parts 
- SolarWinds, Inc.
- Zynga, Inc.
- [dead link]
- "Management Team". Shmoop. Retrieved 2013-10-07.
- "Efficient Frontier: Hacking Madison Avenue". Businessweek. 2006-07-23. Retrieved 2013-10-07.
- "23. Efficient Frontier - Business Insider". Alleyinsider.com. 2008-03-28. Retrieved 2013-10-07.
- "The Keyword Keeper". Forbes.com. Retrieved 2013-10-07.
- "Q&A with Efficient Frontier's Ellen Siminoff". iMediaConnection.com. Retrieved 2013-10-07.
- "Mozilla Jobs — Open Positions". Mozilla.com. Retrieved 2013-10-07.
- Ellen F. Siminoff. "Ellen Siminoff: Executive Profile & Biography - Businessweek". Investing.businessweek.com. Retrieved 2013-10-07.
- "Zynga Appoints Ellen Siminoff to Board of Directors | Zynga". Company.zynga.com. 2012-07-19. Retrieved 2013-10-07.
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