Berghage is the director of the Center for Green Roof Research at the Penn State College of Agricultural Sciences, and teaches a course in Eco-roof technology. He is the extension specialist for greenhouse crops and is involved with garden use of herbaceous plants and new plant evaluations. Berghage teaches a course in herbaceous plant identification, production and use, and teaches plant propagation. Dr. Berghage performs both research and extension outreach at Penn State on flower gardens and green roofs. He manages the Penn State Master Gardener program and is interested in developing pollinator-friendly plantings for the enhancement of pollinator populations.