What is an Arborist?

What is arboriculture? Who can be called an arborist?
 
Arboriculture is the care of trees and shrubs, particularly in urban settings.
 
An arborist is a professional who cares for trees and other woody plants by pruning, fertilizing, monitoring for insects and diseases, consulting on tree related issues, and occasionally planting, transplanting and removing trees.
 
James LeGette, President of Lauderdale Tree Service Inc., is a certifed Arborist (ISA Certified Arborist #0502)