Among the many changes contained within the pending ANSI Z133-2026 revision, none may prove more significant than the restructuring of Section 4, Electrical Hazards. While much attention has been given to chain saws, drop zones and climbing systems, the electrical [...]

CPR is best performed with compressions and rescue breaths. Photo courtesy of John Ball. Arborists have their Z133 Safety Requirements for Arboricultural Operations. This industry consensus standard provides them with the safety recommendations and requirements for performing their [...]

Mark Chisholm, CTSP. Owner and climber, Aspen Tree Expert Company. Jackson, NJ. Climbing: 30+ years. MARK CHISHOLM, CTSP Favorite item in my gear bag: My Double-Bungee Rope Walking System. It’s the easiest system to enable me to ascend [...]

Competitors from Miller’s Tree Service prepare for a day of climbing events. All photos courtesy of Miller’s Tree Service. I've been climbing trees for 23 years now. In that time, I’ve seen our industry evolve in some incredible [...]

Assistant instructor Annamaria Cervantes works with a student in the canopy, helping with movement and the use of a work-positioning lanyard. Photo by Felipe Villegas | Santiago Rosado. Tree climbing has always occupied a unique position within arboriculture. [...]