Professor Marshall's expertise includes: Construction Safety - Specialized construction training, worker fall protection technology, work zone hazard protection technology, Energy System Technology and Home energy reduction systems, Commercial Building energy reduction, battery systems, heating and cooling system efficiency technology, appliance efficiency technology, and waste management technology, including municipal waste compression systems, sanitary waste elimination, and complete waste reuse/recycling systems. He is also an expert in construction claims, including arbitration, mediation, negotiation management, and expert testimony.