"Your Authority on Trees" Advance Tree Service has been family owned and operated from the Lamorinda area since 1987. Darren (WE-6447A) and Lew (WE-3528A) are both certified ISA Arborists. Darren started his business with one pickup truck, one helper and a single newspaper ad. Darren partnered with his father Lew and his mother Faye and sister Lorie and the company officially became incorporated. We are Certified Tree Care Safety Professional (CTSP)#00853 by Tree Care Industry Associations(TCIA), International Society of Arboriculture (ISA), Department of Pest-control (QAL_ #99716 and state business licence ( #611120). We do professional tree care for pruning and thinning, emergency tree care problems, stump removal, consulting, appraisals, health evaluations, planting of tree, insect and disease management, cabling and bracing. Our motto is "don't wait until it's too late, call your local ISA certified Arborist , your authority on trees.