Professor Brian Martin, the sociologist of science from Wollongong University, Australia, first entered the origins of AIDS debate in 1991, when he arranged for the publication of Louis Pascal’s seminal monograph on the OPV theory: “What Happens When Science Goes Bad?”. He has never concealed his belief that the OPV hypothesis has not been fairly treated by mainstream Science, and since about 1997, he has given me a great deal of helpful feedback on my work. During the last 15 years he has written a number of essays on origins-of-AIDS – and his sense of fairness and balance, plus his track-record as a defender of free speech in Science, have won the respect of all sides in the debate. At the Royal Society conference in 2000, he made a speech on “The burden of proof and the origin of AIDS” which caused a significant amount of defensive anger among supporters of Hilary Koprowski and the bushmeat theory. In his latest essay on “Contested Testimony”, available here, he examines the question of whose testimony on key issues such as the CHAT campaigns in Africa (that gathered by Stanley Plotkin and associates, or that gathered by Edward Hooper and associates) is more likely to be reliable.