Meet your Instructors

Craig Frear is Director of Research and Technology at Regenis, a premier farm-based anaerobic digester construction management and operations company. Previously with Washington State University (WSU), he was instrumental in developing one of the nation’s most prolific applied science and engineering programs in organic residuals and animal manure treatment for sustainable reuse. He has authored more than seventy peer-reviewed journal and extension papers while an inventor on eight US patents. He holds a Ph.D. in Engineering Science from Washington State University, a master’s in Educational Administration from Columbia University, and a bachelor’s degree in Chemistry and Theology from St. Olaf College. Craig presently serves on the Board of the American Biogas Council.

Tatjana (Tanja) Vujic is Director of Biogas Strategy for Duke University. In that role, Tanja reports to Duke’s Executive Vice President to create a supply of biogas to fuel its campus steam plants and help the University meet its 2024 Climate Neutrality Goal. Tanja has been involved for nearly two decades in various aspects of biogas development, particularly as it relates to animal waste management, carbon reductions and renewable energy production. In 2010, as director of the Duke Carbon Offsets Initiative, she leveraged state and federal funding to develop the Loyd Ray Farms swine waste-to-energy system with Duke Energy and Google. Using lessons from the Loyd Ray Farms project — the first project in the state to generate renewable energy certificates from swine waste and registered carbon offsets by destroying livestock-sourced methane — Tanja then led a comprehensive analysis of a Directed Biogas approach to power generation from swine waste to accelerate compliance with North Carolina’s Renewable Energy and Energy Efficiency Portfolio Standard. Tanja also teaches on topics related to climate change mitigation, clean energy access and energy equity from time to time. She holds a dual degree B.A. from Yale University in Geology and Geophysics and Studies in the Environment and a law degree from The George Washington University.