Alex Boetzel Alex is a Certified Passive House Consultant and has consulted on dozens of LEED. Passivhaus, high-performance and green residential projects in the United States as well as in Europe. With more than 25 years’ experience in construction and building science, he plans and executes Green Hammer’s innovation concepts and technical training, and ensures quality control of envelope, energy, and water systems in design, construction and commissioning. Alex is currently consulting on the first Passive House certified commercial building in China.