James H Clark is Professor of Chemistry and Director of the Green Chemistry Centre of Excellence, The University of York, UK. He has led the green chemistry movement in Europe for the last 15 years and was the first scientific editor of the journal Green Chemistry and is Editor-in-chief of the RSC Green Chemistry book series. Peter Rudolf Seidl - Professor, Graduate Program on Technology of Chemical and Biochemical Processes, EQ/UFRJ (TPQB/EQ/UFRJ), and responsible for the establishment of the Brazilian Green Chemical School (EBQV). Thesis advisor and project coordinator in physical organic chemistry applied to chemical process areas such as petroleum, pharmaceuticals, mineral technology, etc., publishing widely in these areas and holding an international patent on the use of cashew wastes as a raw material. Former President of the Brazilian Chemical Association (ABQ) and active in the organization of meetings and workshops, such as the 1st International Conference on Chemistry of the Amazon (held shortly after Rio 92) and, more recently, the 1st Workshop on Asphaltenes Characterization and Properties held in 2009 and Biorefineries 2010 Recent Advances and New Challenges, held last November.