felt that no submission met the criterion of the challenge and discredited SENS, although they unanimously agreed that one submission, by Preston Estep and his colleagues, was the most eloquent. Craig Venter succinctly expressed the prevailing opinion: "Estep et al. ... have not demonstrated that SENS is unworthy of discussion, but the proponents of SENS have not made a compelling case for it." Summarizing the judges' deliberations, Pontin wrote in 2006 that SENS is "highly speculative" and that many of its proposals could not be reproduced with current scientific technology. Myhrvold described SENS as belonging to a kind of "antechamber of science" where they wait until technology and scientific knowledge advance to the point where it can be tested. Estep and his coauthors challenged the result of the contest by saying both that the judges had ruled "outside their area of expertise" and had failed to consider de Grey's frequent misrepresentations of the scientific literature. SENS Research Foundation The SENS Research Foundation is a non-profit organization co-founded by Michael Kope, Aubrey de Grey, Jeff Hall, Sarah Marr and Kevin Perrott, which is based in California, United States. Its activities include SENS-based research programs and public relations work for the acceptance of and interest in related research. See also References Further reading 1999 introductions Senescence Immortality Regenerative biomedicine Biomedical engineering Emerging technologies Life extension Gene therapy