Among my most prominent discoveries has been the structure and function of the bacterial type VI secretion system, a "poison-tipped spring-loaded molecular dagger," and the architecture of the type IV pilus responsible for cell motility. All this work is now summarized in a free electronic textbook, the Atlas of Bacterial and Archaeal Cell Structure. Google it and check it out.
In addition to my scientific work, I’m passionate about teaching students about biophysical methods and mentoring up-and-coming scientists. I’m best known by students from my popular course, Getting Started in Cryo-EM, which has over 1M hits.