From Timber Investments Wiki

Anton Greefhorst is a register accountant, economist and president of Stichting Bijsluiterscore. He has published a good number of analyses of hardwood investment products.

More about Anton Greefhorst in Dutch

The Dutch sister wiki has more information about Anton Greefhorst. Useful if you know Dutch. Even more useful would be if you'd care to translate something from Dutch to English.