They were working on trees at my neighbor's house behind my  house.  I needed to remove some branches that had overgrown into the power lines in my back alley.
I saw that they were taking out some trees for my neighbor so I asked the neighbor about them.  He said that they came highly recommended by a friend.  The owner John Pavlik, is a ISA Certified Arborist.
I asked them to take out a large branch that had become intertwined in the power lines.  It was a little complicated in that the branches were heavily intertwined into the power lines quite high off of the ground.  Could not just cut the branch, they first had to go up high on ladders and trim the branches away from the power lines before cutting the branch.
They did a good job and seemed to know what they were doing.
I chatted with the owner, John, for a while and he talked about being very active in the international organization involved with tree trimming safety standards, the ISA.  Tree trimming is one of the most dangerous jobs there is and he was very aware of safety issues for his workers.