- Ph.D, physics, Princeton (1964).
- Bachelor's degree in physics from University of North Carolina (1960).
William Happer is Eugene Higgens Professor of Physics and Cyrus Fogg Brackett Professor of Physics, Princeton University, and Chairman of the Board of Directors of the George C. Marshall Institute and is on the Academic Advisory Council of the Global Warming Policy Foundation (GWPF) .
Stance on Climate Change
"I, and many other scientists, think the warming will be small compared the natural fluctuations in the earth’s temperature, and that the warming and increased CO2 will be good for mankind." 
"There have been similar and even larger warmings several times in the 10,000 years since the end of the last ice age. These earlier warmings clearly had nothing to do with the combustion of fossil fuels. The current warming also seems to be due mostly to natural causes, not to increasing levels of carbon dioxide. Over the past ten years there has been no global warming, and in fact a slight cooling. This is not at all what was predicted by the IPCC models." 
"I am convinced that the current alarm over carbon dioxide is mistaken . . . Fears about man-made global warming are unwarranted and are not based on good science." 
"I am not a climatologist, but I don’t think any of the other witnesses are either. I do work in the related field of atomic, molecular and optical physics. I have spent my professional life studying the interactions of visible and infrared radiation with gases – one of the main physical phenomena behind the greenhouse effect. I have published over 200 papers in peer reviewed scientific journals." 
"We know that carbon dioxide has been a much larger fraction of the earth's atmosphere than it is today, and the geological record shows that life flourished on land and in the oceans during those times. The incredible list of supposed horrors that increasing carbon dioxide will bring the world is pure belief disguised as science." 
May 8, 2013
William Happer and Harrison H. Schmitt  co-author a paper published in the Wall Street Journal entitled, "In Defense of Carbon Dioxide ."  The authors submit that no chemical compound in the atmosphere has a worse reputation than CO2, thanks to the "single-minded demonization of this natural and essential atmospheric gas by advocates of government control and energy production."  The conclusion of the article states that, "The incredible list of supposed horrors that increasing carbon dioxide will bring the world is pure belief disguised as science." 
January 27, 2012
Other "scientists" who signed the article include Claude Allègre , J. Scott Armstrong , Roger Cohen , William Kininmonth , Jan Breslow , Richard Lindzen , James McGrath , Rodney Nichols , Burt Rutan , Harrison H. Schmitt , Nir Shaviv , Edward David , Michael Kelly , Henk Tennekes , and Antonino Zichichi .
Media Transparency reported on the Op-Ed , concluding that most of the scientists have never published articles in peer-reviewed journals on the subject of climate change. They also contacted economist William Nordhaus who had been cited by the article, and he said that the WSJ was guilty of a "Complete Mischaracterization Of My Work." 
Skeptical Science also looked into the signatories , and summarize how the list "only includes four scientists who have actually published climate research in peer-reviewed journals, and only two who have published climate research in the past three decades." Also, almost half have received funding from oil companies and big industry. 
May 20, 2010
February 25, 2009
Testified  before the U.S. Senate Environment & Public Works Committee where he describes how the dangers of CO2 are "Wildly Exaggerated" and "why I and many scientists like me are not alarmed by increasing levels of CO2." 
November 9, 2008
Happer's name appears on an ad funded by the CATO institute addressed to then President-Elect Barack Obama, responding to his statement that "Few challenges facing America and the world are more urgent than combating climate change.The science is beyond dispute and the facts are clear" by saying, "With all due respect Mr. President, that is not true."
1998 – 2008
According to the Associated Press article, the Oregon petition included names that were intentionally placed  to prove the invalid name collection process. The Oregon Petition has been used by climate change skeptics  as proof  that there is no scientific consensus.
- George C. Marshall Institute  — Chairman of the Board of Directors .
- Global Warming Policy Foundation (GWPF)  — Member of "Academic Advisory Council ."
- Department of Energy — Director of Energy Research (1991-1993)
- MITRE — Listed  on Board of Trustees.
- Richard Lounsbery Foundation * — Vice President and member of the Board of Directors .
William Happer appears to have only published one paper on climate change , titled "Climate Science and Policy: Making the Connection."
Note that while the paper appears in Google Scholar, it was published by the George C. Marshall Institute  and not by any peer-reviewed journal.
"Board of Trustees: Dr. William Happer ," MITRE Corporation. Archived March 20, 2011.
"Climate Science in the Political Arena" (PDF ), Statement of William Happer before the Select Committee on Energy Independence and Global Warming U.S. House of Representatives (May 20, 2010).
William Happer's testimony to the Senate Energy Committee on February 25, 2009 . Republished by the Science and Public Policy Institute, April 8, 2009.
"U. S. Senate Minority Report: More Than 700 International Scientists Dissent Over Man-Made Global Warming Claims ." U.S. Senate Committee on Environment & Public Works.
"List of Signers By Name ," Global Warming Petition Project. Accessed December, 2011.
"No Need to Panic About Global Warming ," The Wall Street Journal, January 27, 2012.
"The Journal Hires Dentists To Do Heart Surgery ," Media Transparency, January 30, 2012.
"The Latest Denialist Plea for Climate Change Inaction ," Skeptical Science, January 31, 2012.
Kennedy Maize. "Will Happer: We need more CO2 ," Power, February 25, 2009.
"Members ," U.S. Senate Committee on Environment & Public Works. Accessed May 12, 2013.
"William Happer ," SourceWatch Profile.
"William Happer ," Wikipedia entry.
"In Defense of Carbon Dioxide ," The Wall Street Journal, May 8, 2013.