Emeritus professor of zoology at Columbia University, New York. Described as an elegant older man with swept-back white hair, Dr. Simpson was the world’s leading expert on lizard taxonomy. After Dr. Marty Guitierrez’s acquisition of the remains of an unknown lizard from a tranquilized howler monkey in Cabo Blanco, he decided to send it to Dr. Simpson for identification. It was sent to the Tropical Diseases Laboratory instead after his secretary had notified Dr. Richard Stone of Dr. Simpson’s absense, away in Borneo on a field trip for several weeks. After an examination fax report was sent Dr. Guitierrez, the lizard material was stored the freezer to be later forwarded to Dr. Simpson’s office and identified when he returned (later revealed to be a Procompsognathus).