IUCN Members:
The Nature Conservancy of Canada ( NCC ) / Canada
The Nature Conservancy ( TNC ) / United States of America
US Department of Agriculture - Forest Service / United States of America
IUCN Commissions:
No Commissions are/have been involved
Other non-IUCN related organisations:
Arbor Day Foundation, Tree Canada, American Forests, International Society of Arboriculture, Society of Municipal Arborists, various organizations on the SFI Urban-Community Forestry Task Group