Peter Singer is professor emeritus of bioethics at Princeton University and has been described as the world's most influential philosopher. His many books include Animal Liberation, Practical Ethics, The Life You Can Save, and Ethics in the Real World.
Matthew Lloyd Davies is a veteran actor, audiobook narrator, and director. Throughout his acting career, he has made regular appearances with the Royal Shakespeare Company, Royal National Theatre, in the West End, on international tours, and in award-winning television shows and films.