His scholarly expertise is in geometric and algebraic combinatorics with a general interest (but little expertise) in number theory and the history of mathematics. Professor O'Shea has supervised nine REU students in the past three years and teaches courses across the curricular spectrum; he has a particular vocation for courses with non-STEM majors and future high school math teachers. He lives in Staunton, Virginia with his wife and their young family and likes to walk, chat, bake and read in his spare time. He has recently become a student again, currently taking a workshop class in woodworking and cabinet making.