For the past decade, Rachel Sussman has traveled the world with biologists, photographing ancient organisms. The ages of these living organisms varies from 2,000 to over 80,000 years old. Her project has taken her to Antarctica, where she met a patch of 5,500-year-old moss; Australia, where she photographed stromatolites that helped oxygenate Earth; and Greenland, where ancient lichens grow a centimeter a century. “I approach my subjects as individuals, of whom I’m making portraits, in order to facilitate an anthropomorphic connection to a deep timescale otherwise too physiologically challenging for our brain to internalize,” Sussman explains. The amassed collection eventually became a New York Times bestselling book, The Oldest Living Things in the World. This week, she’ll be in town to explain her project, share images from her travels, and discuss how climate change is impacting these locations.