For more than 130 years, this sixth-generation, family-owned forest-products-company has grown and nurtured its landholdings in the West and, more recently, the Southeast. GREEN DIAMOND RESOURCE COMPANY was founded in 1890 as Simpson Logging Company by Sol Simpson. The lumberman was a tireless innovator whose many advances included the introduction of mechanized log-hauling machines. In addition to its deeded ownership, Green Diamond Management Company has an undisclosed interest in Twin Creeks Timber LLC, a 609,000-acre joint venture with Silver Creek Capital Management. All of the joint venture’s working forests in the West and the Southeast are certified under the Sustainable Forestry Initiative (SFI) standards.