Previously he has been a physical sciences reporter at Science News and a senior editor at Scientific American.
Areas of responsibility include: socio-economics, climate policy, climate risk, environmental policy, sustainability and society.
The US contestants are all present.
He then worked for UK GP magazine Pulse, Nursing Times, and The Food Standards Agency, where he managed its website and print publications.
She has a master of science degree in environmental technology from Imperial College London.
Areas of responsibility include: evolutionary biology including integrative and comparative biology, palaeontology, archaeology, evolutionary developmental biology, taxonomy and systematics, general zoology and botany.