Dr. William Vizuete
Chief Scientific Officer
Dr. Alex Guenther
Chief Research Officer
Chief Operating Officer
Chief Legal Officer
Research Team Lead
Dr. William Vizuete, our Chief Scientific Officer (CSO), has over 20 years of experience in atmospheric chemistry, air-quality modeling and research for various industries. During that time, Dr. Vizuete has authored or co-authored over 70 research papers. Dr. Vizuete utilizes high performance computers and three-dimensional simulations to model the atmosphere to help improve our clients’ understanding about how air pollution forms. Utilizing Dr. Vizuete’s experience and knowledge, PEA is able to improve the tools and methods that policymakers use to make effective strategies to improve air quality, creating a healthier environment for everyone. For the past six years, Dr. Vizuete has led a team of cannabis industry experts focused on site-specific research to increase overall knowledge of cannabis industry emissions, educate local communities and improve the tools and methods that cultivators and policymakers use to better evaluate the environmental impacts of cannabis cultivation and processing.
Dr. Vizuete is perhaps best known for his ground-breaking research into cannabis emissions and air quality in Denver, Colorado. During that study, supported by the Colorado Department of Public Health and Environment as well as the National Center for Atmospheric Research, Dr. Vizuete began creating a first of its kind cannabis terpene library. More recently, Dr. Vizuete designed and oversaw a pioneering cannabis emissions research project in Santa Barbara County, California. Dr. Vizuete is a sought-after expert witness and frequent speaker on topics of interest to cannabis cultivators, regulators, the scientific community and concerned citizens.
Dr. Alex Guenther, our Chief Research Officer (CRO), is an international leader with over 35 years of experience in atmospheric plant volatiles integrated research who has published more than 300 peer-reviewed scientific articles in leading international journals. Dr. Guenther has led more than 40 integrative field studies on six continents in tropical, temperate, and boreal ecosystems to provide observations to advance understanding of terpenes and other biogenic emissions and their role in air quality and climate.
Dr. Guenther was a Senior Scientist and Section Head at the National Center for Atmospheric Research (NCAR) and led the aerosol science program for the Pacific Northwest National Laboratory's Environmental Molecular Science Laboratory. Dr. Guenther has also served as the chair of both the Global Emissions Inventory Activity and the Integrated Land-Ecosystem Process Study for the International Geosphere-Biosphere Program. Dr. Guenther's air quality and emissions models, such as his Model of Emissions of Gases and Aerosols from Nature (MEGAN), are widely utilized by industry, academia and regulatory agencies such as the Environmental Protection Agency. Dr. Guenther's decades of experience and insight help cultivators and policymakers better understand the environmental impacts of cannabis cultivation and processing.
Michael Head, our Chief Operating Officer (COO) and Chief Legal Officer (CLO), is a seasoned corporate attorney and business executive. Mr. Head has served in senior roles, including chief operating officer and general counsel, at international companies in industries as diverse as information technology and manufacturing. As COO, Mr. Head focuses not only on day-to-day business operations but on strategic and tactical planning to keep PEA at the forefront of an ever-changing industry. As CLO, Mr. Head has oversight responsibility for all corporate, regulatory, legal and compliance matters as well as public affairs, including government-relations.
Sarah Zelasky, our Research Team Lead, has 3 years of research experience in air quality and emissions modeling and recently completed her Masters of Science in Environmental Health at the Harvard T. H. Chan School of Public Health. While in school, Ms. Zelasky was involved with multiple research projects at Harvard University, Colorado State University, and Research Triangle Institute (RTI) International where she investigated a number of air quality issues. As a result of her work, Ms. Zelasky received a "top cited article" award from GeoHealth journal, and she is a contributing author on a book being published by RTI Press.
At PEA, Ms. Zelasky works with Dr. Vizuete and Dr. Guenther to help oversee internal and client research projects focused on better understanding Cannabis plant biology and emissions, including odor and air quality considerations, and addressing critical concerns of cultivators, regulators and other stakeholders.