While Adam Smith and David Hume are recognized to have espoused early versions of the ideal observer theory, Roderick Firth is responsible for starting a more sophisticated modern version.
Colin Firth | Firth of Forth | Roderick Murchison | Solway Firth | Firth of Clyde | Vic Firth | Roderick Williams | Roderick Walker | Roderick MacFarquhar | Roderick Haig-Brown | Harry Firth | Tim Firth | Roderick Paulate | Roderick Gradidge | The Adventures of Roderick Random | Sir Nicholas Roderick O'Conor | Roderick Oliver Redman | Roderick James "Jess" McMahon | Roderick Cook | Roderick | Moray Firth | Jonathan Firth | firth | Dornoch Firth | David Firth | Charles Firth | Saint Molaise's cave on Holy Isle, Firth of Clyde | Rosemary Firth | Roderick Welsh | Roderick Taylor |