Positive Net Results: Folding and Unfolding, August 2018, MathFest, Denver, CO.

The Graphic Structure of a Numerical Semigroup, June 2017, Meeting of the Catalan, Spanish, Swedish Math Societies, Umeå, Sweden

Summer 2016 New Student Orientation Survey Results, September 2016, Shippensburg University, Shippensburg, PA

Thinking Outside the Box: Vertical Integration with a Math Circle, December 2015, STEM-UP PA Innovations in Teaching Symposium, Dixon University Center, Harrisburg, PA with S. Bryant

Position Vectors of Numerical Semigroups, September 2014, International Meeting on Numerical Semigroups, Cortona, Italy

The Maximal Denumerant of a Numerical Semigroup, January 2013, Sapienza - Università, di Roma, Rome, Italy.

Filtrations in One-Dimensional Analytically Irreducible Noetherian Local Domains, July 2012, Iberian Meeting on Numerical Semigroups, Vila Real, Portugal

Developing 4-D Spatial Visualization Skills: Just in Case, February 2012, St. Olaf College, Northfield, MN

Introduction to Knot Theory, July 2011, Park City Mathematics Institute, Park City, UT with S. Burns and J. Callahan.

Unique Maximal-Length Factorization in Numerical Semigroups, January 2011, AMS-MAA Joint 2011 Meetings, New Orleans, LA

Sums of Squares and Unique Factorization, November 2010, Dickinson College, Carlilse, PA

Numerical Semigroups and One-Dimensional Rings, April 2010, City University of New York Graduate Center, New York, NY

Filtered Numerical Semigroups and Applications to One-Dimensional Rings, October 2009, AMS Regional Special Session on Commutative Algebra, University Park, PA