After completing her Ph.D., Warny came to the U.S. where she held a joint appointed as assistant professor of research at
Louisiana State University and education director at the Louisiana Museum of Natural Science. In 2008–2014 she was appointed assistant professor and in 2014 promoted to associate professor. She has continued her involvement with the Natural Science Museum, where she currently serves as one of the curators for the museum. Warny is a
palynologists/
paleobotanist and has played a key role in expanding our understanding of Antarctic climate evolution. Working with the Antarctic Offshore Stratigraphy (ANTOSTRAT) team, she provided evidence for Antarctica having experienced significant warming during the mid-Miocene, when land temperatures reached 10 °C, and that liquid precipitation was notably higher at that time. Later, working with SHALDRIL cores she established compelling evidence that the
Antarctic Peninsula lagged the rest of the continent by several million years in its transition into polar conditions. In recent years her research has reached further back in geological time to include the warm
Eocene and
Oligocene, providing new insights into how Antarctica transitioned from Greenhouse to Icehouse conditions. Warny worked with Sarah J. Feakins, partnering with
NASA, in Antarctica and focused on looking for
marine sediment as they are "ideal to look for clues of past vegetation, as the fossils deposited are protected from ice sheet advances, but these are technically very difficult to acquire in the Antarctic and require international collaboration." (Warny). Her findings of (discovering fossils and algae on the seafloor) along with others that she worked with in this project represented that there were summer temperatures in Antarctica 15-20 million years prior. Throughout her career, Warny has remained heavily engaged in public education through her involvement with the LSU Museum of Natural Science. She has helped to design exhibits that have received national recognition. She has also played a key role in establishing new techniques in forensic palynology that have been used nationally. One of her greatest contributions was as a key player in the highly successful Polar Palooza program. In addition to conducting paleoenvironmental research in Antarctica, she is also working on sections in the Mediterranean Sea (her doctoral focus), in the
Gulf of Mexico, in Canada, in Tanzania, and in Papua New Guinea via doctoral student projects and collaborations. To this date, she has advised 15 MS and PhD projects. == Awards and honors ==