Harry N.A. Priem

Credentials

• Ph.D.
• Emeritus Professor of Planetary Geology and Isotope Geophysics, Utrecht University.

Source: [1]

Roy W. Spencer

Credentials

• Ph.D., Meteorology, University of Wisconsin-Madison (1981). [1]

Background

Roy W. Spencer is a research scientist at the University of Alabama, Huntsville.  He operates his own blog on global warming in which he describes himself as a "climatologist, author, [and] former NASA scientist." 

Lee C. Gerhard

Credentials  

• Ph.D., Geology. University of Kansas, 1964.
• M.S., Paleontology minor. University of Kansas, 1961.
• B.S., Geology. Syracuse University, 1958.

Source: [1]

Wibjorn Karlen

Credentials

• Ph.D., professor emeritus of physical geography and quaternary geology.

Background

Karlen is a retired professor in the department of Physical Geography and Quaternary Geology from Stockholm University.