Geoffrey Cloke is a chemist, best known for his new and innovative contributions to synthetic inorganic, organotransition metal and f-element chemistry. As such, his work has focused on creating new classes of chemical compounds, understanding their bonding and studying their reactions, particularly towards environmentally important small molecules such as carbon dioxide.

He is also a world leader in the use of metal vapours for the large-scale synthesis of new molecules. This technique involves vaporising a metal in a vacuum and reacting the resultant metal atoms with other reagents on the wall of a reaction vessel at about 200 degrees Celsius.

Geoffrey is currently Professor of Chemistry at the University of Sussex. He has won numerous awards, including the Corday–Morgan Medal in 1990 and Tilden Lectureship in 1998. In 2012, he was awarded the Sir Geoffrey Wilkinson Award by the Royal Society of Chemistry, which is given for outstanding contributions to pure or applied research in the field of organometallic chemistry.