Allison Justice
Vice President, Cultivation
Allison graduated from Clemson University with a Ph.D. in Plant and Environmental Science. During her time at Clemson, Allison taught greenhouse management to undergraduate students, where they focused on organic methods and production. Allison’s dissertation involved investigating the effects of a beneficial mycorrhizal-type organism (Piriformospora indica), where she learned that organic, sustainable growing can be easy, cost effective, and produce aesthetically pleasing plants when done properly. Post-graduation Allison developed a system to mass rear beneficial nematodes for commercial use that led her to consulting on integrated pest management nationwide. Allison has extensive experience in greenhouse production having helped open and operate her family’s greenhouse business, where they have been growing sustainably for over five years. As a recent transplant from the ornamental sector of horticulture, Allison understands the importance of growing a high quality plant organically and at a low input cost. Through research, Allison is elevating the standards of cannabis cultivation both indoors and in greenhouse settings. Allison's most recent research in lighting had guided OutCo to replace all cultivation rooms with LEDs and mobile racking systems. This has increased OutCo's production by over 2x in the same square footage of indoor growing space by growing vertically.

Dr. Justice has been appointed to the California Industrial Hemp Advisory Board, through May of 2020.

She is also an alumnus of the Class of 2016 of GPN's 40 Under 40.
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Joanne Lutz
Technical Specialist
After receiving her Bachelor of Science degree in Ornamental Horticulture from Delaware Valley College, Joanne launched a career that has been rich with scouting and plant diagnostics. Joanne's career experience includes positions at the Beltsville Agriculture Research Center, US National Arboretum and the University of Maryland Plant Diagnostic Clinic. She also owned an IPM scouting and consulting business for 8 years, worked as a greenhouse grower, customer care technical support and sales throughout the greenhouse, nursery and landscape industry. Joanne cooperated with the University of Maryland on trials using BCAs and pesticide efficacy. She has contributed articles and pictures for the TPM/IPM weekly e-pest reports. Joanne provides growers with technical advice as well as managing Griffin's plant disease diagnostic and water testing programs in which she provides recommendations.
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Calvin Shannon
Bridge West CPAs and Consultants, LLC
Calvin P. Shannon is a principal of Bridge West. With more than 17 years of experience, Calvin provides tax, audit, advisory, estate planning, and trust services. He also has experience in business valuation services.

As part of the Bridge West cannabis team, Calvin assists organizations address the industry’s unique and ever-evolving issues. He enjoys having the opportunity to work with cannabis clients to understand their business needs, and to provide timely solutions.
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Jim Barrett
Professor Emeritus
University of Florida/Barrett Horticultural Consulting
Jim earned his B.S. and M.S. at Auburn University and received a Ph.D. from Michigan State University in Horticultural Science. After retiring from the University of Florida after nearly 40 years, Jim started consulting with growers entering the cannabis market and is now working exclusively with Aphria and Liberty Health Sciences in Florida

Jim served as GPN's consulting editor for more than 20 years. He has authored more than 250 articles and book chapters on research and production recommendations. Jim has worked with more than 35 different companies to develop and evaluate plant cultivars, chemical growth regulators and other products for use in the greenhouse/nursery industry.