Here are the ones I've received (in no particular order):

Brett Czarnecki, Arborist - Treemasters - (412) 370-2133‬ -treemasterspghpa@gmail.com - used to live in Highland Park

Mark Pearce. Senior arborist for city of Pgh. Works with skilled crew and great job cleaning up afterwards. -
412-600-7088 - Treedoc7@verizon.net