Dr. Zerpa is a silvicultural researcher at GWR. His research centers on the management of site resources to improve stand productivity and value, with emphasis on tree nutrition. His experience includes operational management of eucalyptus, gmelina, and Caribbean pine plantations in the tropics, and silvicultural research on loblolly pine systems in the Southeast US. He is currently responsible for GWR’s silvicultural research at the Boardman and Lower Columbia Tree Farms, and for the research trials installed at in the AHB poplar demonstration plantings. Jose obtained his M. S. and Ph. D. in Forestry at North Carolina State University.