My dissertation presents the outlines of a theory about knowledge and virtue. The core idea is that the nature of knowledge is best understood by reflecting on its role in intellectual practice. What distinguishes knowledge from true opinion is not primarily its causal history or its internal structure, as standard theories argue, but rather the way in which knowledge is embedded or rooted in our styles of explanation, modes of communication and methods of teaching. Knowledge becomes rooted in our practices (...) through the cultivation and exercise of intellectual virtue, or the dispositions and skills needed to master varieties of theoretical and practical reasoning. The link to virtuous intellectual activity is what makes knowledge more valuable than true opinion. This suggests that the virtues of intellectual practice are central to our understanding of the nature of knowledge. I devote the first half of the dissertation to showing why we need a theory of virtue in epistemology and how in general that theory ought to be formulated. In the second half, I address skeptical objections and other problems that arise during my formulation of the theory. ;The starting point is a puzzle from Plato's Meno about the value of knowledge. As Socrates observed, true belief has the same practical value as knowledge. So why should we prefer the one to the other or even distinguish between the two? Most philosophers agree that true belief is not enough for knowledge, but there is little agreement about what it lacks and why the distinction matters. Standard attempts to fill this gap either conceive knowledge as true belief with the right kind of causal history or as responsibly formed belief with the right kind of rational structure. But neither strategy is satisfactory because neither adequately reflects the role that knowledge plays in intellectual practice. This suggests that there is something wrong with the standard belief-theoretic analysis of knowledge. I develop a new account of the nature and value of knowledge that better explains the connection between the norms of virtuous inquiry and the goal of understanding. (shrink)