Publikoval některé přelomové práce týkající se systematiky prvoků (1992), předložil systém šesti říší života, fagotrofní teorii o vzniku eukaryotické buňky, novou systematiku bakteriální domény, a podobně.
He is known for introducing starch as a medium for gel electrophoresis in 1955, [3 ] and for the discovery, simultaneously with Mario Capecchi and Martin Evans, of the technique of homologous recombination of transgenic DNA with genomic DNA…
Influenced by Michael Oakeshott, this was an attack on political science and political philosophy as it was then taught. Cowling argued that social science's claim to have discovered how people behaved was false because politics was too…