Internationally recognized expert on biogas and anaerobic digestion. 25 years experience as a builder, heavy equipment mechanic and power plant operator. Warren has written articles about biogas for Renewable Energy World, Post Carbon Institute Energy Bulletin, Permaculture Magazine and The Energy Collective.

Co-founder & COO David Rasmussen brings 22 years of mechanical and residential and commercial building experience to Hestia Home Biogas. He is an ASE certified mechanic with extensive municipal wastewater construction experience. David oversees biogas projects downstream of the first gas shut-off valve, including plumbing and piping, converting engines or appliances.

National Geographic Explorer Thomas Culhane is a professor at Mercy College in New York City. He earned his BS with honors in biological anthropology from Harvard. Ph.D. from University of California, Los Angeles.

Professor Culhane installed the UN's first biogas digester in the UN compound in Baghdad's Green Zone in 2013.