From the relevant chapter, these are: Matthew Collins, Reto Knutti, Myles Allen, and Andrew Weaver. (Note that Zickfeld herself is a contributing author to the chapter but you cannot count her ;))Three of the polled experts were in a Nature paper Stainforth et al 2005 which derived high upper values for sensitivity, which Annan criticized: These are Myles Allen, Stainforth and Matthew CollinsStain