Paul Anderson is known as "Dr TLUD" because of his leadership in Top-Lit UpDraft pyrolytic gasifier technology that makes biochar in sizes from small residential cookstoves up to 55-gallon barrels. See www.drtlud.com , especially the TChar documentation and his presentation on "Barrel-size Micro-gasification for Combined Heat and Biochar (CHAB) in “Mini” Industries" from the ETHOS 2012 Conference 14 days ago.