Short answers, pulled from the story.
Iain Stewart is a Scottish geologist born in 1964 in East Kilbride, Lanarkshire. He holds the Jordan-UK El Hassan bin Talal Research Chair in Sustainability at the Royal Scientific Society in Jordan and is a UNESCO Chair in Geoscience and Society. He is best known to the public as the presenter of BBC Earth science documentaries, including the BAFTA-nominated Earth: The Power of the Planet (2007).
Stewart presented a series of major BBC Earth science documentaries over a fifteen-year partnership with BBC Science, ending in 2015. Key titles include Journeys from the Centre of the Earth (2004), Earth: The Power of the Planet (2007), The Climate Wars (2008), How Earth Made Us (2010), and Planet Oil (2015). He also appeared in the fourth series of Rough Science and in BBC Horizon films.
Cerapachys iainstewarti is a species of ant from Madagascar discovered during the filming of Earth: The Power of the Planet in 2007. It was named in honour of Iain Stewart, who presented that BBC series.
Stewart was appointed a Member of the Order of the British Empire (MBE) in the 2013 Birthday Honours for services to geology and science communication. He has received honorary Doctor of Science degrees from Kingston University (2013), the University of Glasgow (2014), and Ghent University (2021). Professional awards include the Royal Geographical Society Ness Medal (2010), the Geological Society of America President's Medal (2018), and the UNESCO Chair in Geoscience and Society (2018).
Stewart studied geography and geology at Strathclyde University, graduating in 1986 with a first-class honours Bachelor of Science degree. He completed his doctorate at the University of Bristol in 1990; the thesis examined the evolution of neotectonic normal fault scarps in the Aegean Region, focusing on earthquakes in Greece and Turkey.
In 2011 Stewart participated in a project called Eden, a recreation of the Bell Jar experiment. He entered a sealed box measuring 8 by 2 by 2 meters containing plants including banana trees, while oxygen levels were lowered from 20 percent to 12 percent. The experiment demonstrated that the plants could produce enough oxygen to compensate for the reduced levels, with Stewart standing in for the mouse of the original demonstration.