Ben Klemens (born April 10, 1975) is an Australian-American economist and author. He works in the Center for Statistical Research Methods of the United States Census Bureau and was previously a nonresident fellow at the Brookings Institution's Center on Social and Economic Dynamics. He holds a PhD in Social Sciences from Caltech.
In the realm of statistical computing, Klemens has done extensive work on statistical analysis for large data sets and non-traditional models such as agent-based models. He developed an innovative library of statistics functions for C, named Apophenia, and has written a textbook on statistical computing, Modeling with Data.  Klemens has also worked on the policy aspects of computing, and in particular the issue of software patents. He has argued in a book (entitled Math You Can't Use]) and a law review article (PDF) that intangibles such as computer code and mathematics should not be patentable subject matter.
Klemens was previously the executive director of End Software Patents, an advocacy group that has lobbied to eliminating software patents and has organized around the Bilski v. Kappos case that was decided by the Supreme Court in 2010. He is a featured expert in the documentary "Patent Absurdity: how software patents broke the system " (2010). His writings on the subject have appeared in the op-ed sections of The Wall Street Journal, the San Francisco Chronicle, The Washington Post, and other major outlets. He has occasionally commented on broader issues of technology policy and patent law.
- Ben Klemens | Brookings Institution
- Ben Klemens
- Apophenia - Free Software Directory
- Modeling with Data
- U.S. expanding the law - domestic and foreign - to benefit corporations - SFGate
- Math You Can't Use: Patents, Copyright, and Software: Ben Klemens: 9780815749424: Amazon.com: Books
- Groklaw - Math You Can't Use, Ch. 6 ~ by Ben Klemens
- Ben Klemens on software patents - software patents wiki (en.swpat.org)
- Bilski v. Kappos (2010, USA) - software patents wiki (en.swpat.org)
- Patent Absurdity — How software patents broke the system
- Ben Klemens - U.S. Patent Imperialism Hurts American Interests