Crop Loss / Damage Expert Witnesses: 2

Brian Zimmerman, PE, has over 35 years of experience in the Commercial HVAC Engineering and Design market. The past 13 years, Mr. Zimmerman has designed over 350 Cannabis Cultivation and Processing Facilities across the US and Canada. 

Mr. Zimmerman is an expert in sizing and specifying HVAC equipment in the indoor cannabis and controlled environmental agriculture (CEA) markets. His specialty is in HVAC equipment sizing, control, and capabilities for maintaining stable design setpoints for temperature and relative humidity (RH).

Litigation Support - A Registered Professional Engineer in Colorado, Arizona, and California, Mr. Zimmerman provides expert witness services to attorneys representing plaintiff and defendant. Cases include issues with cannabis cultivation and other indoor agriculture facilities. Services include on-site inspection, thorough reporting, depositions, and trial testimony as needed.

Areas of Expertise:

Background Experience - Mr. Zimmerman served as the Executive Vice President of Engineering at Urban-Gro, Inc. from 2019 through August 2022. He was previously the President and Owner of Impact Engineering, Inc., a company acquired by Urban-Gro in March 2019. Mr. Zimmerman founded this company in 1997 to provide full-service HVAC, plumbing, and electrical engineering, and consulting for the cannabis commercial development industry. 

In 2009, Mr. Zimmerman and his team at Impact Engineering designed the first cultivation facility in Colorado for Medicine Man Technologies. Since then, Impact Engineering has designed over 350 cannabis cultivation facilities across the US and in Canada. Mr. Zimmerman has perfected the ability to size and control the indoor environment with mechanical equipment to maximize the quantity, quality, health and consistency of product from harvest-to-harvest.

View Brian Zimmerman's Business Consulting Profile.

John A. Harris, is Principal of Landscape Economics, LLC, President of Earth Advisors, Inc., and a LANDSCAPE ECONOMIST who has worked in the Arboriculture, Forestry, landscape, and horticultural fields for over 40 years. Mr. Harris has provided reputable consulting, education, and project management services for projects across the United States and internationally, in both temperate and tropical ecosystems. Areas of Expertise include:

• Landscape and Tree Risk Assessments
  • Landscape, Tree, Urban Forest, Nursery Plant Value Appraisals
  • Landscape, Tree, Urban Forest, Nursery Plant Damage Appraisals
  • Damage Assessments, Claims, and Recovery Consulting

• Arboriculture Industry Standards and Standard Practices
• Landscape, Arboriculture, Forestry, Environmental Project Management
• Utility Line Clearance Industry Standards and Standard Practices, Electrocution
• Landscape Industry Standards and Standard Practices- Design, installation, maintenance
• Personal Injury and Wrongful Death involving tree or landscape issues
• Municipal Tree Inventory and Management Plans
• Duty of Care and Negligence in Tree and Landscape Maintenance
• Forestry and Forest Resources Management
• Grounds Maintenance Practices
• Arboriculture and Arborist Practices