Kristofer Wollein Waldetoft is a postdoctoral fellow with the Cystic Fibrosis Foundation, working in the laboratory of Sam P. Brown at the Georgia Institute of Technology. The overarching theme of his research is to use theory and concepts from evolution and ecology to address the problem of antibiotic resistance in pathogenic bacteria. In particular, he uses modelling and experiments to better understand the evolutionary ecology of antibiotic resistance in chronic lung infections in patients with cystic fibrosis, a genetic disease that affects several organ systems, including the lung, where it results in life-long infection. For the future, he aimes to combine research on resistance evolution with work in the clinic. Kristofer's background includes the Lund University medical school and a PhD in infection medicine in the laboratory of Lars Björck at the aforementioned university. During his PhD training, he investigated interactions between surface proteins of streptococci and the human blood clotting system, as well as the mechanisms by which saliva induces blood clotting. In his spare time, he rides a laid back bike and paddles on the Chattahoochee river.