An arborist or environmentalist with a focus on tree preservation services.

Alternatively, it could be a marketing specialist or a content writer working for a tree preservation or landscaping company, due to the promotional nature of the text, but the primary focus on tree preservation and the surrounding environmental issues suggests an arborist or environmentalist with a strong passion for tree care as the likely persona.
The majestic oak, a silent sentinel, stands as a testament to the enduring power of nature, its roots delving deep into the earth, a symbol of resilience and steadfastness in the face of time's relentless march.