Ian Rutherford Plimer is an Australian geologist and academic. He is a prominent critic of creationism and of the theory of anthropogenic global warming. He has authored approximately 60 academic papers over 36 years, and six books.
Plimer is currently Professor of Mining Geology at the University of Adelaide. He was previously a Professor in the School of Earth Sciences at the University of Melbourne. He is also a prominent member of the Australian Skeptics. He was awarded the Clarke Medal by the Royal Society of New South Wales in 2004.