Chris Callahan is the Associate Extension Professor of Agricultural Engineering at the University of Vermont. His work focuses on the application of the engineering practice to food systems. Specific engagement is with food producers, processors, and distributors to improve efficiency, quality, safety, and cost control through the integration of technology, systems integration, and process controls. Research and educational programming includes covered growing systems (e.g. greenhouses, high-tunnels), postharvest practices and storage (e.g. water management, environmental control, drying systems, humidification systems, refrigeration systems), energy use in the food system (e.g. farm-based biofuels, renewable energy systems, energy efficiency measures), and development of specialized harvest and postharvest equipment (e.g. hops harvesting, hops drying, meat curing). This work has led to a number of technical innovations that are either in application for patent or have been made available as open-source for public adoption.