Dr William W Vaughan
Dr William W Vaughan (Atmospheric Scientist), retired -“recipient of the NASA Exceptional Service Medal, a former Division Chief of NASA’s Marshall Space Flight Center and author of more than 100 refereed journal articles, monographs, and papers, also now points to natural causes of recent climate changes.”
“The cause of these global changes is fundamentally due to the Sun and its effect on the Earth as it moves about in its orbit. Not from man-made activities,” Dr Vaughan told the minority staff on the Environment and Public Works Committee on February 6, 2009.
One of the many ‘great and good’ dragged out by bloggers and commentators, retired back in 1995, his atmospheric qualification is only a certificate  in effect just a few modules of a degree course and the lowest value of credit, and his doctorate is in engineering science. As for the Sun being the cause this is fully debunked.