Grant Brothers’ Stefano Becomes the Area’s First Double-Certified Arborist
Key Takeaways
- Stefano, part of the Grant Brothers Tree Service team, has become one of the first arborists in Northern Virginia to hold both the ISA Certified Arborist credential and the ISA Tree Risk Assessment Qualification, or TRAQ.
- TRAQ is a specialized, additional credential focused specifically on formally evaluating whether a tree is likely to fail and what it could strike if it does.
- Double certification means clients get both broad arboricultural expertise and a more rigorous, standardized risk evaluation on the same visit.
- This distinction is especially valuable for HOAs, commercial properties, and homeowners who need documented risk assessments for insurance or liability purposes.
- Grant Brothers continues to invest in ongoing certification and training as part of its commitment to Northern Virginia property owners.
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Grant Brothers Tree Service has built its reputation in Northern Virginia on ISA-Certified Arborists who bring real, tested expertise to every job, not just a crew with chainsaws and a truck. That commitment to credentialed, standards-driven tree care took another step forward recently, as our founder – Stefano Devigili completed the ISA-Tree Risk Assessment Qualification (TRAQ), becoming one of the first arborists in the region to hold both the ISA-Certified Arborist credential and TRAQ at the same time.
What Makes This a Meaningful Achievement
Earning the ISA-Certified Arborist credential already requires passing a rigorous exam covering tree biology, soil science, diagnosis, pruning, and safety, along with ongoing continuing education to maintain it. TRAQ is a separate, additional qualification layered on top of that foundation, focused specifically on formal tree risk assessment: systematically evaluating the likelihood that a tree, or part of a tree, will fail, and weighing that against the consequences if it does.
Holding both credentials means Stefano Devigili brings a broader, whole-tree understanding of health, structure, and species behavior, combined with a specialized, standardized methodology for assessing risk when a tree’s safety is in question. Very few arborists in Northern Virginia currently hold both certifications, which is why this milestone matters not just for Stefano personally, but for what it means for Grant Brothers’ clients going forward.
What TRAQ Actually Involves
The ISA’s Tree Risk Assessment Qualification trains arborists in a structured, repeatable process for evaluating tree risk rather than relying on general impressions or gut instinct. That process typically considers the tree’s structural condition, including defects like cracks, cavities, decay, and weak branch unions, the likelihood of failure under normal and severe weather conditions, and what the tree could strike if a failure occurred, a home, a parking lot, a power line, or an area with regular foot traffic.
This matters because tree risk isn’t just about how damaged or diseased a tree looks. A tree with a defect over an empty field presents a very different risk profile than the same defect over a driveway or a bedroom window. TRAQ-trained assessment weighs both the condition of the tree and the consequences of failure together, producing a more defensible, standardized risk rating than an informal opinion would.
Why This Benefits Grant Brothers’ Clients
For homeowners, the practical benefit is a more precise answer to the question every worried property owner eventually asks: is this tree actually dangerous, or does it just look concerning? A formal risk assessment can distinguish between a tree that needs to come down immediately, one that needs monitoring, and one that’s perfectly healthy despite an unusual appearance, sparing clients from either an unnecessary removal or an overlooked hazard.
For HOA boards and commercial property managers, the benefit is more specifically about documentation. A TRAQ-based assessment produces a structured, standardized report that holds up well when a board needs to justify a maintenance decision to residents, or when a property manager needs to show an insurer that reasonable, professional risk evaluation was performed. Because TRAQ follows an internationally recognized methodology, the resulting reports carry more weight than an informal walk-through and a verbal recommendation.
For insurance purposes specifically, having a TRAQ-qualified assessment on file can support both proactive risk management, catching a hazard before it causes damage, and after-the-fact documentation if a storm-related claim needs to show that a tree’s condition was properly evaluated beforehand.
A Deeper Look at Why Double Certification Matters
It’s worth understanding why these two credentials complement each other rather than overlapping.
- The ISA Certified Arborist credential covers the full scope of tree care: species identification, planting, pruning technique, disease and pest diagnosis, soil health, and general best practices across the entire lifecycle of a tree.
- TRAQ, by contrast, is narrowly focused on one specific, high-stakes question: is this tree, or part of it, likely to fail, and what happens if it does? An arborist without TRAQ training can still recognize that a tree looks unhealthy or has visible defects. What TRAQ adds is a formal, standardized framework for translating those observations into a documented risk level, one that’s consistent from tree to tree and defensible to a third party reviewing the findings later. Combining broad arboricultural knowledge with that specialized risk framework gives clients a more complete picture: not just whether a tree is healthy, but specifically how urgent any identified risk actually is.
What This Means for Assessments Going Forward
With Stefano’s dual certification, Grant Brothers is now able to offer clients a more rigorous level of risk assessment on jobs where it matters most: mature trees near homes, aging shade trees on commercial properties, storm-damaged trees where the extent of internal weakening isn’t obvious from the outside, and any situation where a homeowner, HOA board, or property manager needs a defensible answer about whether a tree poses a genuine hazard.
This doesn’t change how Grant Brothers approaches routine pruning, planting, or straightforward removals, which our full team of ISA Certified Arborists already handles to ANSI A300 and Z133 standards. Where it makes the biggest difference is in the harder calls: the leaning tree after a storm, the mature oak with a cavity near the trunk, the tree a neighbor is worried about but that hasn’t shown any obvious signs of failure. Those are exactly the situations where a formal, TRAQ-based assessment provides clarity that a general inspection alone can’t.
The Path to Earning Both Credentials
Reaching this point took years of focused effort. Stefano first earned his ISA Certified Arborist credential after completing the required field experience and passing a comprehensive exam. The exam covered tree biology, diagnosis, and safe work practices. These are the same standards followed by every certified member of our team. He then pursued TRAQ through additional coursework and a specialized exam. The training focused on structured tree risk assessment and required further study and field experience.
Throughout that process, Stefano continued taking on the full range of day-to-day work at Grant Brothers, emergency storm response, routine pruning, plant health assessments, and everything in between, treating the additional certification as something to build on top of hands-on experience rather than a purely academic pursuit. That combination of real fieldwork across Northern Virginia’s varied tree species and conditions, paired with the formal TRAQ methodology, is part of what makes the resulting risk assessments so reliable for our clients.
We’re proud to have a team member willing to put in that level of additional work, and we see it as a reflection of the broader culture at Grant Brothers Tree Service: certification isn’t treated as a box to check when someone joins the company, but as an ongoing professional commitment that continues throughout a career in arboriculture.
Continued Investment in Certification
Stefano’s achievement reflects a broader approach at Grant Brothers Tree Service: treating certification not as a one-time credential to list on a website, but as an ongoing investment in giving Northern Virginia property owners access to the most current, rigorous tree care expertise available. As arboriculture continues to develop more precise tools for diagnosing risk and protecting tree health, our team intends to keep pursuing the credentials that let us bring those advances directly to our clients’ properties.
For homeowners and property managers across Centreville, Reston, Burke, Annandale, Oakton, Springfield, Falls Church, Herndon, Chantilly, McLean, Great Falls, and Vienna, this means access to one of the region’s most specialized risk assessment capabilities, delivered by the same team already trusted for everyday tree care, emergency response, and storm cleanup.
Frequently Asked Questions About TRAQ and Tree Risk Assessment in Virginia
What is TRAQ, and how is it different from being an ISA Certified Arborist?
TRAQ, the ISA Tree Risk Assessment Qualification, is an additional, specialized credential focused specifically on evaluating whether a tree is likely to fail and what it could strike, layered on top of the broader ISA Certified Arborist credential.
Do I need a TRAQ assessment for every tree service?
No. Routine pruning, planting, and straightforward removals don’t require a formal TRAQ assessment. It’s most valuable for trees with visible defects, storm damage, or situations where documented risk evaluation matters for insurance or liability purposes.
How does a TRAQ assessment help with insurance or HOA documentation?
It produces a standardized, defensible written report that clearly documents a tree’s condition and risk level, which carries more weight than an informal opinion when insurers or boards need supporting documentation.
Can a TRAQ assessment tell me if a tree is safe to keep?
Yes. The process is designed to distinguish between trees that need immediate action, trees that should be monitored, and trees that are safe despite an unusual or concerning appearance.
Does Grant Brothers offer TRAQ assessments for commercial properties?
Yes, TRAQ-based risk assessments are available for both residential and commercial properties, including HOAs, businesses, and government-managed sites across our Northern Virginia service area.
Summary Checklist: When to Request a TRAQ Risk Assessment
| Situation | What to Check | What to Do |
| Tree has visible cracks or cavities | Structural defect severity | Request a formal TRAQ risk assessment |
| Tree is leaning after a storm | Root plate condition | Schedule a risk evaluation before deciding on action |
| HOA needs maintenance documentation | Existing inspection records | Request a TRAQ-based written report |
| Insurance requires risk documentation | Prior assessment history | Provide a dated, standardized risk report |
| Large tree near a home or parking area | Consequence of potential failure | Prioritize for a formal assessment |
| Uncertain whether a tree needs removal | Overall health vs. risk level | Get a professional opinion before removing a healthy tree |
Final Advice
Stefano’s dual ISA Certified Arborist and TRAQ credentials add another level of expertise to Grant Brothers’ tree care services. These qualifications combine broad arboricultural knowledge with specialised tree risk assessment training. That means clients can get a clearer understanding of a tree’s health, condition, and potential risks. It also helps determine whether a tree truly needs removal or can be safely preserved. This expertise is especially valuable for mature trees, storm-damaged trees, and trees near homes or other structures.
Reviewed by a Certified Arborist
This article has been reviewed by a certified arborist to ensure the description of ISA Certified Arborist and TRAQ credentials is accurate and reflects current industry standards.
