Philippe Cuénoud is a Swiss entomologist and botanist living in Geneva, who worked on the Psocoptera of Switzerland and Papua New Guinea. He found the only contemporary population of Lachesilla rossica near Geneva, and described the species Novopsocus magnus and Novopsocus caeciliae, from Papua New Guinea, collected in the Madang and Morobe provinces in 1993.
He studied the phylogeny of the Ilex genus (Aquifoliaceae), which led to the synonymy of Nemopanthus with Ilex. He also studied the plant order Caryophyllales (made up of about 30 plant families), sequencing the matK gene for many of its genera, and analysing the pigments of some of them. These results contributed to the recognition of the families Barbeuiaceae, Gisekiaceae, Limeaceae and Lophiocarpaceae.