About Us

Who We Are

At Greenleaf Labs, we strive to re-define the relationship between growers, laboratories, and consumers of medical marijuana. By investing in industry-leading technologies and experienced personnel, our laboratory delivers rapid, accurate, and consistent results with complete transparency. Our combination of customer service and scientific innovation simultaneously promotes consumer safety and client growth. Through customizable and flexible support, our partnership is geared towards your success.

Our Location

Meet Our Team

Jennifer Hobbs
Laboratory Director
Jennifer Hobbs

Jennifer Hobbs is the Laboratory Director at Greenleaf Labs. She has over 10 years of laboratory experience. Jennifer Hobbs has developed a wealth of experience and knowledge in cannabis testing and experiments from sampling and experimental design, sample processing, and analysis, all the way through interpretation and application of findings. She is responsible for method development, optimization, validation and troubleshooting on Liquid-Chromatography-Mass Spectrometry (LC-MS), Gas Chromatography-Mass Spectrometry (GC-MS), Inductively Coupled Plasma Mass Spectrometry (ICP-MS), and Ultra High-Performance Liquid Chromatography (HPLC). Other fields of expertise include product testing experimental design and analysis, quality assurance system implementation and laboratory accreditation, development and implementation of laboratory information management systems, among others.

Joseph Reynolds
Laboratory Analyst
Joseph Reynolds

Joe was born and raised on a small farm in Camden, AR. He attended Arkansas Tech University in Russellville, AR, where he met his wife; and graduated in 2002 with a Bachelor of Science in Agriculture Business. He moved to Fort Smith, AR in 2003 and began his adventure in field of laboratory Sciences. He worked for OK Foods for 7 years with an emphasis in Serology and Microbiology, next he spent a brief period at Pfizer specializing in virology and sanitation, he then spent the next 10 years at Tyson foods furthering his knowledge in Microbiology and even becoming a manager in the lab for 3 years while also becoming a novice in certain chemical analysis before leaving Tyson to work closer to home and raise a child. Joe entered the cannabis field in August of 2020 as a Microbiology analyst. He continued to hone his skill as a Microbiologist and started expanding his knowledge in Chemical analysis. In April of 2021 Joe began working for Greenleaf labs in Poteau, OK and has brought years knowledge and leadership to our laboratory. 

Johann Lopez
Laboratory Analyst
Johann Lopez

Growing up in Southern California, the culture largely revolved around two things: the ocean and marijuana. As a research scientist, Johann studied marine biochemistry at the University of California, where he completed a B.S and M.S. publishing papers on marine photosynthetic communities in the context of environmental chemistry. From there, he decided to apply his skill set to a more practical field. Transitioning from academia to the legal marijuana industry allowed Johann to continue refining his scientific acumen while also exploring a secondary passion. Before coming to Oklahoma, he enjoyed a rapid ascension at a high-volume testing laboratory in the heart of Orange County. Now, he manages the potency and residual pesticide analyses for Greenleaf Laboratories, where he continues to master incredible instrumentation while serving the patients of his new home.

Casey Johnson
Laboratory Analyst
Casey Johnson

After receiving a bachelor’s degree in Microbiology and Cellular Genetics from Oklahoma State University in 2019 Casey continued to Medical Technology school in Tulsa, OK. “My time learning the ins and outs of medical technology has directly translated into my career in cannabis as methodologies are similar if not the same.” With her past technical experience Casey brings a new outlook to the cannabis industry and to Greenleaf Labs.

George Driever
Laboratory Analyst
George Driever

Educational degrees include a B.S. in Biology with a Chemistry Minor, an M.S. in Botany with an emphasis in Horticulture, and a Ph.D. in Plant Pathology with a focus in fungal plant diseases. Graduate research was centered on the development a weather driven model to control Pecan Scab in commercial pecan orchards in Oklahoma. The Pecan Scab Model operates on the Oklahoma Mesonet weather system during the growing season.

Postdoctoral research was conducted at the Kearney Agricultural Center near Parlier, CA through the U.C. Riverside Campus. My work there was to develop a similar model to predict a fungal disease on Pistachio in the Central Valley. Later, I managed a research lab for Dr. Adaskaveg where we tested Novel (unregistered fungicides) on stone fruit trees and fruit. We also tested samples of Navel oranges for a fungal disease on lots of fruit being shipped to Korea. Disease lesions from the fruit were tested with both agar plating and PCR methods. Results were sent to the USDA.

My personal interests are many, but my favorites are gardening (traditional and hoophouse) and caring for a small orchard. I enjoy spending time with my family and cooking.

Erica Perez
Sample Intake Specialist
Erica Perez

Erica has multiple years of cannabis sample intake experience. Before jumping into the cannabis industry, she was a pharmacy technician where she compounded specialty medications. Erica prepares your samples for analysis and ensures the correct method is used for each matrix. She ensures your samples are received following OMMA guidelines, answering your questions over the phone, and overseeing one of the most important tasks in the lab- sample intake.

Kayla Adams
Sample Intake Specialist
Kayla Adams

Kayla has 3 years experience in the cannabis industry. Before joining the team at Greenleaf Labs, she was the logistics manager for a cannabis grower and has worked in a dispensary. Kayla was born and raised locally in Poteau. She enjoys spending her free time with friends and family, and taking her dog on walks. She is one of our Sample Intake Specialist’s. Kayla is ready to answer any questions our clients may have and ensure that they have a positive experience.

Crystal Harger
Receptionist
Crystal Harger

Crystal will be the first person you will meet as you begin your partnership with Greenleaf Labs, she will help determine (or guide you to) what services you need with a helping perspective, and a friendly manner.