Dr. Haack's research addresses the broad area of plant-insect interactions. He is very interested in how environmental stresses like drought, acid rain, and global warming alter the normal balance between insects and their host plants. In the field of invasion ecology, he deals with two recently introduced forest beetle pests as well as in the general theory of pest risk assessment. He is also conducting studies on endangered insects (e.g., the Karner blue butterfly), effects of forest management activities on insect biodiversity, prairie restoration, and riparian ecosystems.