John R. Christy

University of Alabama, Huntsville; Director, Earth System Science Center. Expertise: Temperature record. Phone: (256) 961-7763. E-mail. Web site. Publications. Bio. Wikipedia. See discussion under "Skeptics".

Thomas R. Karl

NOAA National Climatic Data Center. Expertise: Directs the principal U.S. repository of instrumental climate data. Phone: (828) 271-4476. E-mail. Web site. Publications. Bio: US Global Change Research Program (scroll down) and Johns Hopkins University (includes publications).

Michael Mann

Penn State University. Expertise: Temperature record of past 10,000 years. Phone: (814) 863-4075. E-mail. Web site. Publications. Bio.