About Us

Global Tree Preservation’s owner, Odis Sisk, is a third generation arborist and has been in the arboriculture industry for more than a decade.  As an International Society of Arboriculture Certified Arborist, Utility Specialist, and Tree Worker, he is well equipped in the many aspects of tree care and preservation.

Throughout his career, Odis has performed many roles including production climbing arborist, instructor, safety director, and plant health care consultant.  He is a competitive Tree Climber and has encouraged camaraderie and stressed the importance of workplace safety at the competitions for the past several years.

Odis has traveled throughout the United States, Canada, Brazil, Australia, and Puerto Rico climbing and teaching.

ISA Certifications
-ISA Member 2002-Present
-ISA Certified Arborist 2003-Present
-ISA Certified Tree Worker/Climber Specialist 2003-Present
-ISA Certified Utility Specialist 2003-Present

North American Training Solutions Instructor 2006-Present
- Emergency Response and High Angle Rescue
- Tree Climbing, Fall Protection and Work Positioning
- Spar Pole Climbing and Rigging Techniques
- High Angle Tree Removal
- Rigging and Aerial Chain Saw Operation
- Technical Felling and Felling/Removal of Trees 30 to 70°
- Electrical Hazard Awareness Training
- Aerial Lift Operation, Rescue and Rigging Operations
- Climbing Competition Preparation and Organization
- Crane Removal Techniques

Tree Climbing Competitions
- Southern Chapter Tree Climbing Champion 2011
- Georgia Tree Climbing Champion 2006-2011
- Florida Tree Climbing Champion 2008
- International TCC Competitor 2006, 2008, 2011
- Facilitator 1^st Brazilian Tree Climbing Championships 2008
- Facilitator 2^nd Brazilian Tree Climbing Championships 2009

Chapter Conference Presentations
- Brazilian Society of Arboriculture 2007 (Vitoria, BR)
- Climbing/Rigging Techniques

- Brazilian Society of Arboriculture 2008 (Manaus, BR)
- Climbing Competition Preparation
- Climbing Techniques/Rigging Techniques

- Brazilian Society of Arboriculture 2009 (Acre, BR)
- Climbing Competition Preparation
- Climbing Techniques
- Tree Risk Assessment, Emergency Response and EHAT
- Pruning Techniques

- Michigan Chapter 2009
- Climbing Techniques
- Mechanical Advantage
- Crane Safety and Removal Techniques

Indiana Arborist Association 2010
- Climbing Efficiency

Inventor
- Monkey Tail Spar Descent System

Research
- Knots Utilized in Rigging Operations (Tree Fund) 2010

Articles
- Chainsaw Transport and Storage during Pruning Operations (Climbers Corner; Arborist News, April 2010)

Rachel Q. Landers Sisk



Rachel graduated from the University of Georgia with a Bachelor of Arts in Studio Art and concentration in Scientific Illustration.  She has over 12 years experience in office work and customer service.  Rachel works in a less visible role as the company's Office Manager.  She also works with the website and other artistic endeavors for GTP as well as her own art studio.  She enjoys recreational tree climbing, travelling to competitions, biking, and all the arts - especially enjoying living in an area so closely involved with all of these.