Urban and community forestry, urban forest health, stress disorders (deicing salt damage), urbanized soils, diseases of trees and shrubs, risk assessment and management, tree preservation during construction activities, dysfunctional root systems (including stem girdling roots), and nursery tree production.
Chair, Minnesota Shade Tree Short Course, 1992-2020
Director, Minnesota Tree Care Advocate program, 1992-2020
Tree Failure Due to Loading Events.
Stem Girdling Root Syndrome: Causes, Effects, Prevention, Treatment.
Effects of Construction Activities on Tree and Urban Forest Health: Early Detection, Prevention and Treatment.
Production of Nursery Grown Trees and Shrubs: Gravel Bed Systems, Pot-in-Pot Production, Producing Quality Root Systems.
Effects of Deep Planting on the Health and Condition of Trees.