Arthur Georges is an ecologist and herpetologist with research interests in the evolution ecology and systematics of Australian reptiles. He is an internationally recognised expert on the evolution and ecology of reptile sex determination. His proposal that genetic and environmental sex determination represent ends of a continuum has revolutionized understanding of how the complex thermal environment of nests dictates sex in reptiles. His work redirected thinking on how reptiles survived past climate changes, and how human activities constrain their ability to respond to future challenges.