While finishing his B.A. at UCLA he started his teaching career at The Harvard School (now The Harvard-Westlake School) in North Hollywood, California. While at the University of Arizona he taught part-time at Brophy College Preparatory in Phoenix, Arizona. In his last year at Stanford University, he was the Teaching Assistant Mentor for the Philosophy Department, running a series of workshops on teaching and learning.
He began his professorial career at Saint Louis University before moving to the University of California, Riverside. At Riverside he was Director of Undergraduate Studies for the Department of Philosophy.
He has held visiting teaching positions at the Claremont Colleges (including Claremont Graduate University, Claremont McKenna College and Scripps College), Simon Fraser University (just outside Vancouver, British Columbia), and Yonsei University in Seoul, South Korea. He has also held visiting research positions at Oxford University, the Northern Institute of Philosophy at the University of Aberdeen, and the University of Cologne.
He regularly teaches undergraduate courses in epistemology, philosophy of psychology, and philosophy of language, as well as graduate research seminars in epistemology and related areas.