[3][4] Gill was inspired into a scientific career whilst exploring caves in the hills of Acadia National Park, when it struck her that they had formed when the sea level was higher, and were lifted up when Maine's coast bounced back after being pushed down by the weight of Ice Age glaciers.

[6] She then moved to the University of Wisconsin, where she completed a PhD entitled, "The biogeography of biotic upheaval: Novel plant associations and the end - Pleistocene megafaunal extinction", under the supervision of Dr John Williams in 2012.

[11] She is an Ice Age ecologist who uses natural experiments of the past to understand the impacts of climate change on the extinction and interactions of different species, communities and ecosystems.

[17] In 2019, while filming the documentary "Lost Beasts of the Ice Age" in Siberia, Gill was hospitalized for deep vein thrombosis which manifested as multiple blood clots in both her legs and lungs.

[21] She is the co-host of the podcast "Warm Regards" (founded July 2016) along with meteorologist Eric Holthaus and climate journalist Andy Revkin of The New York Times.