As a result of his efforts to move the timber industry toward a more professional and sustainable approach to forestry, he became widely known as one of the nation’s first leading advocates of sustained yield forest management.

In 1936, Mason created a partnership with Donald Bruce — Mason & Bruce. Not long thereafter, James Girard joined the group, and in 1948 the firm adopted its present name — Mason, Bruce & Girard.

By the middle of the 20th Century, David Mason’s and MB&G’s influence on the forestry industry was second to none. In fact, in 1952 F.K. Weyerhaeuser said of David Mason: “No single person has been more influential in promoting sound forest management on private forest lands than he.”

Over the years, MB&G has expanded its range of services, and today has diversified into a full-service natural resources consulting firm, with expertise in environmental services, forestry and geographic information systems (GIS).