How to tell the difference between at Tree Lopper and an Arborist

http://nami-cc.org/treeservicegoldcoast71/post-an-arborist-or-193589.html

One of the very pressing needs after a thunderstorm is to truly have the branches and leaves of the trees in a compound trimmed. Here a differentiation has to be produced between the Arborist and the tree lopper