Professor Yopp's interests include proof and reasoning teaching and learning and the knowledge needed for effective mathematics instructional coaching in elementary and middle grades. He is the co-principal investigator on the 3.5 million dollar NSF-funded DRK-12 Grant Examining Mathematics Coaching, EMC http://www.math.montana.edu/~emc/
. He has published in the Journal for Mathematical Behavior, Investigation in Mathematics Learning, Mathematics Teaching in the Middle School, Teaching Children Mathematics, the MAA Focus,
and Linear Algebra and Its Applications
, among others.