Mary Ann Piette, deputy of the Building Technologies Department at Lawrence Berkeley National Laboratory.Mary Ann is an energy geek we love. She develops and evaluates low-energy and demand response technologies for buildings. She specializes in commissioning, energy information systems, benchmarking and diagnostics. And she has written more than 100 papers on efficiency and demand response. In 2006, she received the Benner Award at the National Conference on Building Commissioning for contributions to making commissioning business as usual.