Entomologist (working on Hemiptera) at The Netherlands Institute for Vectors, Invasive plants and Plant health (NIVIP). Volunteer for the Naturalis Biodiversity Center (RMNH).

Always up for an expedition to the tropics!

Founder of the website https://truehopperswp.com/. Besides Auchenorrhyncha, I have a wide interest in birds, mammals, butterflies, dragonflies, and other insects.

Working on European and Neotropical Auchenorrhyncha, with a specific interest in Fulgoromorpha. Focus groups are Cixiidae, Derbidae, and Achilidae, but any taxonomically problematic or undescribed species can get my attention!

https://www.researchgate.net/profile/Marco-De-Haas

Current projects:

• Auchenorrhyncha of the Netherlands - an ongoing project with yearly fieldwork in my home country.
• Auchenorrhyncha of the Dutch Antilles (Aruba, Bonaire, Curaçao, Saba, St. Eustatius and St. Martin) - a project that includes some field trips to the Caribbean and lots of collection work. The goal of the project is to publish all available records of Auchenorrhyncha from the Dutch Caribbean in a series of papers, describing new species, providing photos of all taxa and providing/collecting ecological data for these species.
• Cixiidae diversity in the Neotropics - this project combines some fieldwork with collection and literature research. The Cixiidae form a highly diverse group in the Neotropics with an astonishing percentage of undescribed taxa.
• Derbidae diversity of the Guianas (Guyana, French Guiana and Suriname) - a new project to fix some old taxonomically challenging taxa, describe new species and publish new faunistic records from the Guianas.
• Achilidae diversity of the Neotropics - as the previous projects, this project combines fieldwork with detective work in literature and collections. Since 1950 (Fennah's world revision of Achilidae), hardly any new Achilidae have been described from the Neotropics, despite the presence of numerous undescribed genera and species. This project aims at redescribing taxa, describing new taxa and collecting ecological data. The latter is problematic since nearly all museum specimens lack ecological data and Achilidae are easiest collected on light traps. If anyone spots observations of Neotropical Achilidae with potentially interesting ecological data, please tag me!