electric power generation and delivery, hydropower, renewable energy, solar/photovoltaic, water and wastewater treatment, waste management, electronics, semiconductor manufacturing, optoelectronics, fiber-optics, aerospace and avionics, LEDs and lighting, fire, and dental. PennWell publishes over 130 print and online magazines and newsletters, conducts 60 conferences and exhibitions on six continents, and has an extensive offering of books, maps, websites, research and database services. In addition to PennWell's headquarters in Tulsa, Oklahoma, the Company has major offices in Nashua, New Hampshire; London, England; Houston, Texas; Mountain View, California; Fairlawn, New Jersey; Moscow, Russia; and Hong Kong, China.