Weyerhaeuser Co. manufactures, distributes and sells forest products. It is primarily engaged in the growing and harvesting of timber; the distribution and sale of forest products; and real estate construction and development. The company operates through the following segments: Timberlands, Wood Products, Cellulose Fibers & Real Estate. The Timberlands segment manages private commercial forestland worldwide. This segment is engaged in growing and harvesting trees for lumber, building, pulp, paper and other wood products. It also exports logs to other countries, plants seedlings, monitors and cares for the new trees and helps to sustain the timber supply from its forestlands. The Wood Products segment delivers lumber, structural panels, engineered wood products and complementary products for residential and commercial applications. This segment offers homebuilding solutions and exports its softwood lumber and engineered building materials to Asia and Europe. The Cellulose Fibers segment produces absorbent fluff, which is used in diapers; manufactures liquid packaging board and other pulp products, which are used in the production of liquid product containers; and generates energy from black liquor produced at the mills. The Real Estate segment is focused on constructing single-family housing and developing residential lots through its subsidiary, Weyerhaeuser Real Estate Co. Weyerhaeuser was founded by Frederick Weyerhaeuser in January 1900 and is headquartered in Federal Way, WA.