You can probably assume they are in contact with the leading experts in the field. From the letter: The initial version of this document was drafted by

You can probably assume they are in contact with the leading experts in the field. From the letter: The initial version of this document was drafted by Stuart Russell, Daniel Dewey & Max Tegmark, with major input from Janos Kramar & Richard Mallah, and reflects valuable feedback from Anthony Aguirre, Erik Brynjolfsson, Ryan Calo, Tom Dietterich, Dileep George, Bill Hibbard, Demis Hassabis, Eric Horvitz, Leslie Pack Kaelbling, James Manyika, Luke Muehlhauser, Michael Osborne, David Parkes, Heather Roff Perkins, Francesca Rossi, Bart Selman, Murray Shanahan, and many others.