Today, Dr. David C. Culver tells us about his work on subterranean cave ecosystems. Dr. Culver is an environmental scientist and professor at American University who focuses on studying cave and seep fauna. He attended Grinnell College for his BA and then got a PhD at Yale University. He has traveled the world researching, from caves in Slovenia to seeps in Washington D.C. He is also the author/editor of 5 books and over 100 articles and works with the National Park Service to study the distribution and biology of seep fauna that are endemic to Washington D.C's national parks.

Today, we chat with Dr. Tyler James Mackey about Antarctica's McMurdo Dry Valleys. Mackey is an Assistant Professor at the University of New Mexico and a Postdoctoral Associate at MIT. His research uses sedimentology to analyze life's evolution through microbial layers of the McMurdo Dry Valleys' lakes. Mackey has worked on over 15 research publications and currently researches how microbial evidence can potentially show us the origin of complex life in the McMurdo lakes.

Today, we talk with Dr. Paddy Sullivan, director of the Environment and Natural Resource Institute at Alaska Anchorage University. Dr. Sullivan specializes in research on arctic ecosystems, specifically the Boreal Tundras of Northern Alaska's Brooks range. His current research consists of studying boreal tree advancement and its relation to climate change. Dr. Sullivan has been published in journals such as Science and Nature and has collaborated on over 70 publications.