James Lambert is a documentarian and a professor of film with an important movie online, Conspiracy Theorists Lie (2015). It deals primarily with the assassination of President Kennedy and the way people have fallen for so many lies surrounding the case. James believes that conspiracy theories are dangers for society and that is why he has put a good deal of effort into speaking out against them.
You can learn more about the film at http://nomagicbullets.org
You can learn more about James, and read things James has written at http://jamesklambert.com