Nearly full time tropical biodiversity ecologist and conservationist in Costa Rica.

Research Interests

I am a tropical ecologist who specializes on animal-plant interactions in Costa Rican tropical dry forest and on biodiversity development and management of large conserved tropical ecosystems. I work as a team with my wife, Winnie Hallwachs, likewise a tropical ecologist. Special research emphasis is given to Lepidoptera larvae (caterpillars), their food plants, and their parasitoids (parasites). This information is processed into user-friendly databases, images and web pages for the public domain available at Special conservation emphasis is given to seeking ways for decentralized administration of the non-damaging use of large conserved wildlands by society. Examples are biodiversity prospecting, carbon sequestration, ecotourism, biodiversity services to agriculture, and direct field research.

Membership Type


Election Year


Primary Section

Section 63: Environmental Sciences and Ecology