Robert Willmschen

Safety-Kleen Corp. used to provide environmental and cleaning services. It provided services designed to collect, transport, process, recycle or dispose of hazardous and non-hazardous industrial and commercial waste streams. The Company provided these services in 50 states, ten Canadian provinces, Puerto Rico, Mexico and Saudi Arabia from collection, processing and other locations. It was founded in Milwaukee in 1963 by Ben Palmerand and was located in Columbia, SC

Arthur Andersen LLP used to provide accounting services. It was also into consulting services for clients that operate businesses throughout the United States and around the world. Arthur Andersen was founded in 1913 and was headquartered in Chicago, IL.

Heritage-Crystal Clean, Inc. engages in the provision of parts cleaning and waste management services to the manufacturing and vehicle service sectors. It operates through the Environmental Services, and Oil Business segments. The Environmental Services segment includes parts cleaning, containerized waste management, vacuum truck services, antifreeze recycling activities, and field services. The Oil Business segment consists of used oil collection, recycled fuel oil sales, used oil re-refining activities, and used oil filter removal and disposal services. The company was founded by Joseph Chalhoub in 1999 and is headquartered in Hoffman Estates, IL.