Paul Varello

Dravo Corp manufactures and supplies lime products. It activities include the production of construction aggregates and lime for industrial, utility, municipal and construction applications. The company was founded in 1891 and is headquartered in Pittsburgh, PA.

The Ryland Group, Inc. engages in homebuilding and provision of mortgage-related financial services. It operates through the following segments: Homebuilding, Financial Services, and Corporate. The Homebuilding segment includes the sale and construction of single-family attached and detached housing, town homes, and condominiums. Its four geographically-determined Homebuilding Regions include North, Southeast, Texas, and West. The Financial Services segment includes loan origination and mortgage, title, escrow and insurance services to its homebuyers. The Corporate segment is a non-operating business unit segment whose purpose is to support operations. The company was founded by James P. Ryan and Robert J. Gaw in 1967 and is headquartered in Westlake Village, CA.

Covanta ARC LLC operates waste-to-energy generation facilities. Its plants convert solid waste material & produce electricity to power homes and businesses. The company is headquartered in Montvale, NJ.

The American Society of Civil Engineers, founded in 1852, is the oldest national engineering society in America. The non-profit company is based in Reston, VA and has subsidiaries in the United States. With over 150,000 members worldwide, the organization advocates for sustainable and resilient practices to maintain and modernize the nation's infrastructure. The company also works to increase investment in infrastructure and improve engineering knowledge and competency. The society's Civil Engineering Landmark Program recognizes historically significant civil engineering projects, structures, and sites.

National Association of Corporate Directors provides online and print information services to directors of public companies. It offers in-boardroom education, evaluation, governance reviews, board composition and succession planning, board recruitment, ongoing advisory, insights, and analytics services. The company was founded in 1977 and is headquartered in Arlington, VA.

The American Institute of Chemical Engineers (AIChE) is a professional society with over 60,000 members in more than 110 countries. The private company is based in New York, NY, and has subsidiaries in the United States. AIChE offers various programs, including e-learning, webinars, and career advancement, to help chemical engineers at every career juncture bridge the skills gap created by the rush of technology, changing work styles, and unprecedented societal needs. Founded in 1908, AIChE is a focal point for information exchange on the frontiers of chemical engineering research in areas such as energy, sustainability, biological and environmental engineering, nanotechnology, and chemical plant safety and security.