External Links

**September 2022**: Value-Offset Bifiltrations for Digital Images, with Anway De and Thong Vo, was published in*Computational Geometry*.**Fall Semester 2022**: I am teaching Math 234: Discrete Math and Math 262: Probability Theory.**May 2022**: Computing Minimal Presentations and Bigraded Betti Numbers of 2-Parameter Persistent Homology, with Michael Lesnick, was published in the*SIAM Journal on Applied Algebra and Geometry*.**April 2022**: Preprint of Piercing Numbers in Circular Societies, with Kristen Mazur, Mutiara Sondjaja, and Carolyn Yarnall, is available on arXiv.org.**Spring Semester 2022**: I am teaching Math 242: Modern Computational Math and Math 262: Probability Theory.**Fall 2021**: "Magic Triangles", written with Gabriel Hale and Bjorn Vogen, appeared in*The Pi Mu Epsilon Journal*. (preprint copy)**Fall Semester 2021**: I am on sabbatical. I'm working with Matt Richey on a computational mathematics textbook based on Math 242 at St. Olaf College.**December 2020**: Topological Data Analysis on Simple English Wikipedia Articles, with Xiaojun Zheng, was published in the PUMP Journal of Undergraduate Research.**September 2019**: I gave a colloquium talk about persistent homology at Creighton University.**August 2019**: I gave four lectures on topological data analysis at the Southeastern Undergraduate Mathematics Workshop at Georgia Tech.