Paul Feyerabend (1924-1994) studied science and philosophy before earning his Ph.D. in philosophy of science in Vienna in 1951. He made a name for himself as a vocal proponent of Popper’s critical rationalism, before becoming one of its most ardent critics. With his international best-seller Against Method (1975), he became one of the twentieth century’s most famous philosophers of science. Karl Popper (1902-1994) is widely regarded as one of the twentieth century's greatest and most influential philosophers of science. He argued against inductivist accounts of scientific method traditionally used to distinguish science from non-science, developing what has become a popular alternative: falsificationism, according to which we propose and nature disposes. He was also a social and political philosopher of considerable stature, emphasizing the constructive role of criticism as the driving force of progress in both science andin society. Matteo Collodel is an independent scholar and a tenured high school teacher in philosophy, history and the social sciences. He earned his MA and his PhD in philosophy from the “Ca’ Foscari” University of Venice (Italy), with the philosophy of science as his main area of specialization and historically-oriented dissertations on the philosophy of Mary Hesse (2001) and on Paul Feyerabend’s idea of incommensurability (2007). He was a postdoctoral research fellow at the Humboldt University of Berlin (2008-2012), where he was engaged in a project on Feyerabend's unpublished correspondence and papers. He is currently working on an intellectual biography of Feyerabend. Eric Oberheim, author of Feyerabend’s Philosophy (2006), is an internationally renowned Feyerabend scholar who has edited Feyerabend’s posthumously published The Tyranny of Science (2011) and Feyerabend’s The Philosophy of Nature (2016). He is currently working on his Habilitation at the Humboldt University of Berlin, as well as editing a series of volumes of Feyerabend’s correspondence.