Board and Staff


Ken Borchert — Bureau of Indian Affairs, NW Regional Office, Portland, Oregon

Jim McWhorter, Chairman — Terra Verde, Inc., La Center, Washington

Brian Sharer  Finite Carbon, Inc., Portland, Oregon

Don Wales Hancock Natural Resource Group, Vancouver, Washington

Marc Vomocil — Starker Forests, Inc., Corvallis, Oregon


James D. Arney, Ph.D., President — Forest Biometrics LLC, St. Regis, Montana (contracted)

Dan Opalach, Ph.D., Forest Biometrician – dba Opalach Forestry Consulting, Redding, California (contracted)

Richard Zabel, Business Manager — Western Forestry & Conservation, Portland, Oregon (contracted)

Brock Purvis, Technical Support – Northwest Management, Inc., Moscow, Idaho (contracted)

Background on President James D. Arney

Dr. James D. Arney brings over fifty years of forest biometrics industrial experience touching every aspect of inventory design, growth & yield, and harvest planning in six western States and three Canadian Provinces.  He has designed  in-place inventory systems, calibrated yield models for over twenty (20) tree species, developed site index curves, taper models, managed GIS systems and staff, developed hydrographic, soil and wildlife databases and prepared and presented sustained yield plans for public and private organizations through the western North America.  He has developed silvicultural regimes and forest management plans for almost every major species and forest type found in the American Northwest.

Dr. Arney is the only forest biometrician who has designed and built four separate and unique computerized forest growth models (PhD. Dissertation distant-dependent whole tree (1969), USFS-Weyerhaeuser distant-dependent (1975), SPS distant-independent (1981), and FPS distant-dependent (1995)).  Both SPS and FPS have been distributed world-wide and represent the most-used, integrated forest management tool set for forest inventory and silvicultural planning on “working forests” in the western United States.

Background on Dr. Daniel Opalach

Dr. Dan Opalach spent the first 28 years of his career working for Green Diamond Resource Company on the North Coast of California developing forest inventories, silvicultural prescriptions, and management plans for their 2nd and 3rd growth redwood and Douglas-fir stands. Looking for new challenges, in 2017 Dan decided to move to the Sacramento Valley and start his own forestry consulting business where he is able to assist timberland owners throughout the Pacific Northwest maximize the value of their timberland assets.

Dr. Opalach is passionate about all aspects of forest mensuration. Sampling, direct measurements of trees, and forest growth and yield are topics that he has studied and utilized for decades. In 2016 and 2017, Dan had the pleasure to teach this material to upper division forestry students at Humboldt State University. Teaching forest mensuration enhanced his passion for understanding the underlying scientific foundations of this critically important forest management subject area.

Going forward Dr. Opalach will work closely with Dr. Jim Arney to assist timberland owners utilize the full power of the Forest Projection and Planning System (FPS). Dr. Opalach relied on FPS for over 10 years while working at Green Diamond and is an enthusiastic supporter and user of the program. FPS is unique in that it can be localized to a specific timberland property using Dr. Arney’s 10m site technology. Dan is looking forward to helping timberland owners adopt this technology so they can better understand the productive capacity of their forest lands and develop management plans to maximize the value of their timberland properties.