مؤلف: O. G. Vitzthum

R. J. Clarke, also co-editor of the widely-acclaimed six-volume work Coffee published between 1985 and 1988, is a consultant based in Chichester U. K. O. G. Vitzthum, formerly Director of Coffee Chemistry Research worldwide at Kraft, Jacobs, Suchard in Bremen, Germany is Honorary Professor at the Technical University of Braunsweig, Germany and Scientific Secretary of the Association Scientifique Internationale du Café (ASIC), in Paris France.