About Rockwell Associates

John Rockwell Hosbach, Jr.

John Rockwell Hosbach, Jr. is a highly effective Registered Consulting Arborist, Certified Arborist and Landscape Consultant with over twenty-two years of experience in the diagnosis and evaluation of woody plants. John possesses a strong ability to assess longevity, potential risk, monetary value, and the ability to tolerate environmental change or construction injury of trees and shrubs. John also provides investigation, documentation, formal report writing, and expert opinion for HOA’s, Residents, Arbitration, Jury, and Non-Jury Trials. John specializes in urban tree inventories and management plans for a wide range of clientele.

registered consulting arborist, #483
ISA certified arborist, PD-0372


  • ISA Tree Risk Assessment Qualification (TRAQ) Assessor
  • 560 Tree Care Programs designed
  • 625 Tree Appraisals conducted
  • Expert Opinion on tree related failures in Pennsylvania and New Jersey
  • Supervision of tree care crews for high-end corporate and residential clients
  • Twenty-two years of consulting on landscape issues
  • Insect and disease diagnosis and control
  • Tree assessment, recommendations, and maintenance
  • Tree and plant appraisal qualified – TPAQ
  • Specimen tree valuation
  • Hazard tree assessment and management
  • One-on-One Homeowner consultation



  • Urban Forestry / Business Management – 1995
  • Paul Smith College of Forest Sciences, Paul Smith, NY
  • Consulting Academy – 2006
  • Dale Carnegie Management School
  • Current Continuing Education Credits – 600


  • Reviewed and offered recommendations regarding tree planting, existing and proposed
  • Inspected and offered recommendations for the trees belonging to a country club concerning their health and potential risk of failure
  • Assisted homeowners in recovering the lost value of trees
  • Assisted and completed numerous workshops, conferences, and seminars regarding tree maintenance, risk assessment, and valuation