The following sections from the ASC Z133 Policies and Standards Development Procedures describe the scope of the Z133 Committee and participation therein:
The scope of the ASC Z133 includes development of requirements and recommendations—as well as definitions and supporting information—for safety in the arboricultural maintenance operations affecting trees, shrubs, and other woody plants. The Z133 standard contains arboricultural safety requirements for pruning, repairing, maintaining, and removing trees; cutting brush; and for using equipment in such operations.
Participation in the Z133 standards process shall be open to all persons who are directly and materially affected by the standard. These Policies are written to ensure that there are no undue financial barriers to participation, and that voting participation on a consensus body is not conditional upon membership in any organization, nor unreasonably restricted on the basis of technical qualifications or other such requirements. Participation is available through voting membership on the consensus committee, membership on task groups, by meeting participation, or by public review and comment.
| Committee Member | Company/Organization Represented |
| Robert Bell | U.S. Department of Labor (OSHA) |
| Don Blair, Vice Chair | Sierra Moreno Mercantile Company, Inc. |
| Gerard A. Breton | Lucas Tree Experts Company |
| Frank Castillo | USDA U.S. Forest Service |
| Steve Chisholm | Aspen Tree Expert Company, Inc. |
| Michael Clark | Wright Tree Service |
| Mike Dirksen | Society of Municipal Arborists |
| Tom Dunlap | Individual |
| Patrick Flynn | The F.A. Bartlett Tree Expert Company |
| Richard Germain | Altec Industries |
| Jamie Goddard | Yale Cordage, Inc. |
| Dave Goodson | Utility Arborist Association |
| John Hushagen | International Society of Arboriculture |
| Joe Jimmo | Penn Line Service, Inc. |
| George Klinger | National Insurance Programs |
| Daniel K. Mayer | Massachusetts Arborist Association |
| Scott McDaniel | Edison Electric Institute |
| Jim Ostvig | Tree Care Industry Association |
| Ken Palmer | ArborMaster Training |
| Dieter Paries | Arizona Public Service |
| Jim Pennefeather | Buckingham Manufacturing Company, Inc. |
| Scott Prophett | North American Training Solutions |
| H. Dennis P. Ryan, Chair | Individual |
| Andrew Salvadore | Asplundh Tree Expert Company |
| David Schuller | National Park Service |
| Kathy Shaw | McCoy Tree Surgery |
| Cary Shepherd | Husqvarna |
| Keith Sheriff | KS Services |
| Tobe Sherrill | SherrillTree |
| John J. Sullivan | Lewis Tree Service, Inc.
|
| James Tomaseski | Int’l Brotherhood of Electrical Workers |
| Joe Tommasi | Davey Tree Expert Company |