Dr Deeming works on various families of Diptera from Dr Tony van Harten's samples collected in the United Arab Emirates, and has written chapters on the Muscidae, Calliphoridae, Anthomyzidae and Mydidae in Vol. 1 (2008) of van Harten's Arthropods of the UAE. In addition, he has submitted chapters on Hippoboscidae, Nemestrinidae and Oestridae for Vol. 2 and this year will complete Milichiidae, Chloropidae, Diopsidae and Asteiidae for Vol. 3, to be published in 2009.
Additional work focuses on ongoing manuscripts of taxonomic revisions of African species of Atherigona and Chloropidae, which are major pests of cereals.