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Tree Risk Assessment, Consulting, Preservation and Appraisal

Ronald E. Rothhaas, Jr.


asca RCA #794 Registered Consulting Arborist logo
Board Certified Master Arborist ISA logo

Arbor Doctor owner Ron Rothhaas is a Registered Consulting Arborist (RCA), an ISA Board Certified Master Arborist®, a frequent contributor to the nationally syndicated In The Garden With Ron Wilson radio gardening show, and is the primary author and contributor of the Plant Health Care Newsletter for the Ohio Green Industry Association. Ron has been an ISA (International Society of Arboriculture) Certified Arborist® since 2004 and in February 2017 passed the exam for ISA Board Certified Master Arborist®RCAs have achieved the highest level of arboricultural credentialing available and can handle the most challenging and highest-profile assignments. The ISA Board Certified Master Arborist® credential is the highest level of certification offered by ISA. This credential recognizes ISA Certified Arborists® who have reached the pinnacle of their profession. In addition to passing an extensive scenario-based exam, candidates must abide by the ISA Board Certified Master Arborist® Code of Ethics which ensures quality of work and high ethical standards. Fewer than two percent of all ISA Certified Arborists® currently hold this certification.

Ron and other host on 55KRC

Ron Also maintains the Tree Risk Assessment Qualification (TRAQ) through the International Society of Arboriculture and the Tree and Plant Appraisal Qualification (TPAQ) through the American Society of Consulting Arborists.

Consulting Services logo with two people shaking hands with tree in background

Horticultural and Arboricultural Consulting

Arboricultural Consulting. A profession which involves the independent and objective application of technical knowledge, analytical skills, and professional judgment to tree-related issues in order to provide observations, conclusions, and appropriate recommendations. Arboricultural Consultant (also known as a Consulting Arborist).  An individual engaged in arboricultural consulting.  ASCA members must adhere to Standards of Professional Practice. Consulting: the providing of expert knowledge to another party for a fee.

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Consultations for Individuals, Litigation, Insurance, Architects, Builders and More. . .

Contact Arbor Doctor for arboricultural and horticultural consultation and evaluation services for individuals, builders, architects, insurance, and legal case evaluation including:


ISA Tree Risk Assessment Qualified with picture of tree losing branch

Hazard Tree Assessment

Red oaks and pin oaks tend to get decay in the trunk and the root system which causes them to fail catastrophically. I have been watching a particular,  monster pin oak for several years because I knew it had substantial decay and it had all the signs of a tree that was getting ready to fail. I mentioned it to the owner several years ago but nothing was done. I figured it was only a matter of time before we had a real mess and possibly serious injury. I was happy to see that the tree was finally removed before the tree failed. A large amount of decay was clearly visible in the interior parts of the base at the tree. This is one of the things that a consulting arborist with a tree risk assessment qualification knows to look for. Not all decay is an automatic removal. A great number of trees can live for years, if not indefinitely, with a significant amount of decay, if managed properly. We know what to look for and how to do it.

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