Roy W. Spencer
- Ph.D., Meteorology, University of Wisconsin-Madison (1981). 
After languishing in the darkness for ten years, a national climate policy in Canada could take shape during an anticipated first ministers meeting in Vancouver next month. The meeting fulfills a...
Karlen is a retired professor in the department of Physical Geography and Quaternary Geology from Stockholm University.
According to the NRSP, Clark completed his graduate studies at the University of Waterloo and at the Université de Paris Sud (Orsay) in isotope hydrogeology and paleoclimatology. 
Clark is a professor in the Department of Earth Sciences at the University of Ottawa.