The highest level of certification for arborists is typically referred to as a Board Certified Master Arborist (BCMA). This certification is offered by the International Society of Arboriculture (ISA), which is a globally recognized organization for arboriculture professionals.

To become a Board Certified Master Arborist, an individual must first obtain the ISA Certified Arborist credential, which requires passing an examination covering a wide range of topics related to tree care and maintenance. After achieving the Certified Arborist credential, candidates must accumulate a significant amount of experience in the field and pass an additional, more rigorous examination to become a Board Certified Master Arborist.

Board Certified Master Arborists are recognized for their advanced knowledge, skills, and experience in arboriculture, and they are often sought after for complex tree care projects, consulting services, and leadership roles within the industry.