Yes, I know Kevin's work. Kevin tends not to conduct original research and is not part of the scientific community that's actively working in this area. He is known to work with policy groups favouring a shift from outright prohibition to a sort of prohibition light. I wouldn't place Kevin in the group of highly credible scientists who are working in this area who are taking a bit more of a nuanced approach.
On May 27th, 2014. See this statement in context.