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• "Gamifying permutation patterns"; Twenty-second International Conference on Permutation Patterns; University of Idaho (Moscow, Idaho); June 13, 2024. (slides)
• "Patterns in permutations"; Eighteenth Annual Texas Undergraduate Mathematics Conference; Stephen F. Austin State University (Nacogdoches, Texas); October 28, 2023. (slides)
• "Finding Your Direction in Undergraduate Research", Texas Section NExT presentation; Stephen F. Austin State University (Nacogdoches, Texas); October 28, 2023. (slides)
• "Patterns in permutations"; Chan Stanek Lecture for Students; Mathfest (Tampa, Florida); August 4, 2023. (slides) (recording)
• "Packing patterns in restricted permutations"; Southeastern International Conference on Combinatorics, Graph Theory & Computing; Florida Atlantic University (Boca Raton, Florida); March 10, 2023. (slides)
• "Patterns in Parking Functions"; Southeastern International Conference on Combinatorics, Graph Theory & Computing; Florida Atlantic University (Boca Raton, Florida); March 10, 2023. (slides)
• "Engaging students in combinatorics research"; 44th Australasian Combinatorics Conference; University of Otago, New Zealand (virtual); December 13, 2022. (slides)
• "Patterns in Permutations"; UW Math Hour; University of Washington (virtual); March 20, 2022. (slides) (recording)
• "Cultivating Opportunities for Discovery", 2021 Tennessee Mathematics Teachers Association Annual Conference; Memphis University School (Memphis, Tennessee); October 23, 2021. (slides)
• "Finding Your Direction in Undergraduate Research", Wisconsin Section NExT Fall Conference (virtual); October 23, 2021. (slides)
• "Patterns in Permutations: the hidden and surprising structures that emerge from ordered lists", Math Encounters presentation, National Museum of Mathemtics (virtual); June 2, 2021. (slides) (recording)
• "Patterns in permutations", Moravian Student Mathematics Conference; Moravian College (virtual); February 13, 2021. (slides)
• "Discovery, Inside and Out"; 2020 Valparaiso Symposium on Undergraduate Research and Creative Expression keynote speaker; Valparaiso University (Valparaiso, Indiana); May 14, 2020. (slides) (recording)
• "What's in your wallet!?"; Math for Everyone Seminar Series; University of Notre Dame (Notre Dame, Indiana); November 17, 2016. (slides)

• "What really counts: the joy of enumeration"; Professorial Lecture (in celebration of promotion to the rank of Full Professor); Valparaiso University (Valparaiso, Indiana); April 14, 2022. (slides) (recording)

• "The Joy of Discovery"; Alder Award Presentation; Mathfest 2014 (Portland, Oregon); August 8, 2014. (slides)

• 2024-2025
  • (*) "An Erdos-Szekeres Permutation Game"; Special Session on Permutation Patterns; AMS Fall Eastern Sectional Meeting; University at Albany (Albany, New York); October 20, 2024. (slides)
• 2023-2024
  • (*) "Patterns in Permutations"; MathPath Plenary talk; Rockhurst University (Kansas City, Missouri); July 6, 2024. (slides)
  • (*) "Patterns in Permutations"; MSCS Colloquium; St. Olaf College (Northfield, Minnesota); March 11, 2024. (slides)
• 2022-2023
  • (*) "What's in your wallet!?"; MathPath Plenary talk; University of Portland (Portland, Oregon); June 28, 2023. (slides)
  • (*) "Pattern-avoiding parking functions"; MSU Combinatorics and Graph Theory Seminar; Michigan State University (virtual); September 8, 2022. (slides)
• 2021-2022
  • (*) "Patterns in Permutations"; MathPath Plenary talk; Mount Holyoke College (South Hadley, Massachusetts); July 22, 2022. (slides)
  • (*) "Pattern-avoiding parking functions"; UW Combinatorics Seminar; University of Washington (Seattle, Washington); May 18, 2022. (slides)
  • (*) "Patterns in Permutations"; Mathematics Colloquium; Colby College (Waterville, Maine); March 11, 2022. (slides)
  • (*) "Pattern avoidance in parking functions"; Experimental Math Seminar; Rutgers University (virtual); February 10, 2022. (slides) (recording)
  • (*) "Sorting permutations via shuffles"; Special Session on Experimental Mathematics in Number Theory and Combinatorics; AMS Fall Southeastern Sectional Meeting (virtual); November 20, 2021. (slides)
  • (*) "Patterns in trees"; Invited Paper Session on Open and Accessible Problems for Undergraduate Research; Mathfest 2021 (virtual); August 5, 2021. (slides)
  • (*) "Patterns in generalized permutations"; Invited Paper Session on Open and Accessible Areas in Computational Mathematics; Mathfest 2021 (virtual); August 4, 2021. (slides)
• 2020-2021
  • "Patterns in Permutations"; Undergraduate Colloquium; Valparaiso University (Valparaiso, Indiana); March 19, 2021. (slides)
  • (*) "Packing patterns in restricted permutations"; New York Combinatorics Seminar; Brooklyn College (virtual); December 11, 2020. (slides)
• 2019-2020
  • (*) "Packing patterns in restricted permutations"; Experimental Math Seminar; Rutgers University (Piscataway, New Jersey); March 5, 2020. (slides) (recording)
  • (*) "What's in your wallet!?"; Mathematics Seminar; Hofstra University (Hempstead, New York); March 4, 2020. (slides)
  • (*) "Statistics on hypercube orientations"; Special Session on Experimental and Computer Assisted Mathematics; 2020 Joint Mathematics Meetings (Denver, Colorado); January 18, 2020. (slides)
  • (*) "Packing patterns in restricted permutations"; Special Session on Patterns in Permutations; AMS Fall Southeastern Sectional Meeting; University of Florida (Gainesville, Florida); November 3, 2019. (slides)
  • (*) "What's in your wallet!?"; Mathematics Colloquium; Butler University (Indianapolis, Indiana); October 11, 2019. (slides)
• 2018-2019
  • (*) "What's in your wallet!?"; MathPath Plenary talk; Grand Valley State University (Allendale, Michigan); July 19, 2019. (slides)
  • "Packing patterns in restricted permutations"; Seventeenth International Conference on Permutation Patterns; University of Zurich (Zurich, Switzerland); June 20, 2019. (slides)
• 2017-2018
  • "On the distribution of peaks (and other statistics)"; Sixteenth International Conference on Permutation Patterns; Dartmouth College (Hanover, New Hampshire); July 12, 2018. (slides)
  • (*) "Patterns in Trees"; Special Session on Open and Accessible Problems for Undergraduate Research; 2018 Joint Mathematics Meeetings (San Diego, California); January 11, 2018. (slides)
  • (*) "What's in your wallet!?"; Mathematics Colloquium; Grand Valley State University (Allendale, Michigan); October 12, 2017. (slides) (recording)
• 2016-2017
  • "Sorting with Pop Stacks"; Fifteenth International Conference on Permutation Patterns; Reykjavik University (Reykjavik, Iceland); June 29, 2017. (slides)
  • (*) "Sorting with Pop Stacks"; Special Session on Algebraic and Enumerative Combinatorics with Applications; AMS Spring Central Sectional Meeting; Indiana University (Bloomington, Indiana); April 2, 2017. (slides)
  • "Sorting with Pop Stacks"; Math and Statistics Faculty Research Seminar; Valparaiso University (Valparaiso, Indiana); March 21, 2017. (slides)
  • "What's in your wallet!?"; Undergraduate Colloquium; Valparaiso University (Valparaiso, Indiana); January 27, 2017. (slides)
  • (*) "Pattern avoidance in reverse double lists."; Special Session on Enumerative Combinatorics; AMS Fall Central Sectional Meeting; University of St. Thomas (Minneapolis, Minnesota); October 29, 2016. (slides)
• 2015-2016
  • "Pattern avoidance in reverse double lists"; Fourteenth International Conference on Permutation Patterns; Howard University (Washington, DC); June 27, 2016. (slides)
• 2014-2015
  • "Pattern avoidance in double lists"; Thirteenth International Conference on Permutation Patterns; DeMorgan House (London, UK); June 15, 2015. (slides)
  • (*) "Pattern-avoiding forests"; Special Session on Patterns in Permutations and Words; AMS Spring Eastern Sectional Meeting; Georgetown University (Washington, DC); March 8, 2015. (slides)
  • (*) "Pattern avoidance on k-ary heaps"; Special Session on Patterns in Permutations and Words; AMS Spring Eastern Sectional Meeting; Georgetown University (Washington, DC); March 8, 2015. (slides)
  • (*) "Teaching Inquiry through Experimental Mathematics"; MAA Session on Teaching Inquiry; 2015 Joint Mathematics Meeetings (San Antonio, Texas); January 13, 2015. (slides)
  • (*) "Pattern-avoiding ascent sequences"; AMS Special Session on Enumerative Combinatorics; 2015 Joint Mathematics Meetings (San Antonio, Texas); January 11, 2015. (slides)
  • (*) "Ascent sequences avoiding 0021"; Special Session on Experimental Mathematics in Number Theory, Analysis, and Combinatorics; AMS Fall Eastern Sectional Meeting; Dalhousie University (Halifax, Nova Scotia); October 18, 2014. (slides)
  • (*) "OEIS meets UGR"; DIMACS Conference on Challenges of Identifying Integer Sequences; Rutgers University (Piscataway, New Jersey); October 9, 2014. (slides)
  • (*) "Pattern avoidance in double lists"; Special Session on Patterns in Permutations and Words, and Applications; AMS Central Fall Section Meeting; University of Wisconsin - Eau Claire (Eau Claire, Wisconsin); September 21, 2014. (slides)
• 2013-2014
  • "Ascent sequences avoiding pairs of patterns"; Twelfth International Conference on Permutation Patterns; East Tennessee State University (Johnson City, Tennessee); July 7, 2014. (slides)
  • (*) "How to Count like a Mathematician"; Math Club Talk; University of Wisconsin - Eau Claire (Eau Claire, Wisconsin); October 22, 2013. (slides)
  • (*) "Pattern Avoidance in Trees"; Rutgers Experimental Math Seminar; Rutgers University (Piscataway, New Jersey); September 26, 2013. (slides) (recording part 1) (recording part 2)
• 2012-2013
  • "Avoiding an Ordered Partition of Length 3"; Eleventh International Conference on Permutation Patterns; University of Paris Diderot (Paris, France); July 1, 2013. (slides)
  • (*) "How to Count like a Mathematician"; Valparaiso Experience in Research by Undergraduate Mathematicians (VERUM) Seminar; Valparaiso University (Valparaiso, Indiana); June 7, 2013. (slides)
  • (*) "How to Count like a Mathematician"; Christopher Center Faculty Seminar; Valparaiso University (Valparaiso, Indiana); March 27, 2013. (slides)
  • (*) "Pattern Avoidance in Permutations"; LaCIM Seminar; Université du Québec à Montréal (Montréal, Québec); March 15, 2013. (slides)
  • (*) "Pattern Avoidance in Rook Monoids"; AMS Special Session on Patterns in Permutations and Words; 2013 Joint Mathematics Meetings (San Diego, California); January 12, 2013. (slides)
  • (*) "Pattern Avoidance in Trees"; Notre Dame Discrete Math Seminar; University of Notre Dame (Notre Dame, Indiana); November 27, 2012. (slides)
  • (*) "Non-contiguous Pattern Avoidance in Binary Trees"; Special Session on Permutations Patterns, Algorithms, and Enumerative Combinatorics; AMS Fall Eastern Sectional Meeting; Rochester Institute of Technology (Rochester, New York); September 23, 2012. (slides)
• 2011-2012
  • "Non-contiguous Pattern Avoidance in Binary Trees"; Tenth International Conference on Permutation Patterns; University of Strathclyde (Glasgow, Scotland, UK); June 15, 2012. (slides)
  • (*) "Beautiful Bijections for Permutation Patterns"; MAA Invited Paper Session on Clever Counting or Beautiful Bijection?; 2012 Joint Mathematics Meetings (Boston, Massachusetts); January 5, 2012. (slides)
• 2010-2011
  • "Enumeration Schemes for Dashed Permutation Patterns"; Ninth International Conference on Permutation Patterns; California Polytechnic State University (San Luis Obispo, California); June 21, 2011. (slides)
  • (*) "Automated Enumeration of Pattern Avoiding Permutations"; Pacific Workshop on Pattern Avoiding Permutations; Simon Fraser University (Burnaby, British Columbia); March 31, 2011. (slides)
  • "Pattern Avoiding Colored Partitions"; Eighth International Conference on Permutation Patterns; Dartmouth College (Hanover, New Hampshire); August 9, 2010. (slides)
• 2009-2010
  • (*) "Pattern-Avoiding Colored Partitions"; AMS Special Session on Enumerative Combinatorics; 2010 Joint Mathematics Meetings (San Francisco, California); January 15, 2010. (slides)
  • (*) "Counting Pattern-Avoiding Permutations"; Trinity University Mathematics Majors' Seminar; Trinity University (San Antonio, Texas); November 19, 2009. (slides)
  • (*) "An Introduction to Enumeration Schemes"; Trinity University Mathematics Colloquium; Trinity University (San Antonio, Texas); November 18, 2009. (slides)
  • (*) "Counting Pattern-Avoiding Permutations"; Wabash College Math & Computer Science Colloquium; Wabash College (Crawfordsville, Indiana); October 20, 2009. (slides)
• 2008-2009
  • "Avoiding the Pattern 31542"; Seventh International Conference on Permutation Patterns; University of Firenze (Florence, Italy); July 16, 2009. (slides)
  • "An Introduction to Enumeration Schemes"; AWM Workshop for Women Graduate Students and Recent PhDs; 2009 Joint Mathematics Meetings (Washington, DC); January 8, 2009. (slides)
  • (*) "Enumeration Schemes for Permutations Avoiding Barred Patterns"; AMS Special Session on Experimental Mathematics; 2009 Joint Mathematics Meetings (Washington, DC); January 5, 2009. (slides)
• 2007-2008
  • "Enumeration Schemes for Permutations Avoiding Barred Patterns"; Sixth International Conference on Permutation Patterns; University of Otago (Dunedin, New Zealand); June 17, 2008. (slides)
  • (*) "Counting Pattern-Avoiding Permutations"; Trinity Research Experience for Undergraduates; Trinity University (San Antonio, Texas); June 11, 2008. (slides)
  • "Barred Permutation Patterns"; Graduate Student Combinatorics Conference 2008; University of California (Davis, California); April 12, 2008.
  • "Enumeration Schemes for Pattern-Avoiding Words and Permutations"; Ph.D. Thesis Defense; Rutgers University (Piscataway, New Jersey); April 7, 2008.
  • "Experimenting with Barred Patterns"; Rutgers Experimental Math Seminar; Rutgers University (Piscataway, New Jersey); March 13, 2008.
  • "Counting Trees"; Rutgers Pizza Seminar; Rutgers University (Piscataway, New Jersey); February 1, 2008.
  • (*) "How to Cleverly Count Pattern-Avoiding Words"; AMS Special Session on Applications of Computer Algebra in Enumerative and Algebraic Combinatorics; 2008 Joint Mathematics Meetings (San Diego, California); January 8, 2008. (slides)
  • "An Introduction to Enumeration Schemes (or How I Taught My Computer to Count)"; Rutgers Graduate Combinatorics Seminar; Rutgers University (Piscataway, NJ); December 10, 2007.
• 2006-2007
  • "Schemes for Pattern-avoiding Words"; Prague Midsummer Combinatorial Workshop XIII; Charles University (Prague, Czech Republic); August 1, 2007.
  • "Schemes for Pattern-avoiding Words"; Fifth International Conference on Permutation Patterns; University of St. Andrews (St. Andrews, Scotland, UK); June 11, 2007. (slides)
  • "How to Count Words Cleverly"; Graduate Student Combinatorics Conference 2007; University of Washington (Seattle, Washington); April 21, 2007. (slides)
  • (*) "How to Count Words Cleverly"; Topology Et. Al. Seminar; Wesleyan University (Middletown, Connecticut); April 4, 2007.
  • (*) "All About 1089"; Princeton Graduate Lunch Seminar; Princeton University (Princeton, New Jersey); October 3, 2006.
  • "How to Count Permutations Cleverly"; Rutgers Pizza Seminar; Rutgers University (Piscataway, New Jersey); September 13, 2006.
• 2005-2006
  • "A Bijection on {123-132}-Avoiding Multiset Permutations"; Fourth International Conference on Permutation Patterns; Reykjavik University (Reykjavik, Iceland); June 12, 2006.
  • "The Bergman Complex of a Matroid"; Rutgers Tropical Math Seminar; Rutgers University (Piscataway, New Jersey); November 16, 2005.
  • "All About 1089"; Rutgers Pizza Seminar; Rutgers University (Piscataway, New Jersey); October 14, 2005.
• 2003-2005
  • (*) "Pebbling and Cover Pebbling"; DIMACS REU; Rutgers University (Piscataway, New Jersey); June 22, 2004.
  • "Pebbling, Cover Pebbling, and Chocolate"; Rutgers Pizza Seminar; Rutgers University (Piscataway, New Jersey); March 26, 2004.
• 1999-2003 (undergraduate talks)
  • "Graph Cover Pebblings"; Indiana Section MAA meeting; Butler University (Indianapolis, Indiana); March 28, 2003.
  • "An Introduction to Hypergraphs"; Undergraduate Colloquium -- Senior Presentation; Valparaiso University (Valparaiso, Indiana); March 18, 2003.
  • "Graphs of Essentially Equivalent Lattice Paths"; Nebraska Conference for Undergraduate Women in Mathematics; University of Nebraska (Lincoln, Nebraska); February 8, 2003.
  • "Cross Numbers of Minimal Zero Sequences"; Undergraduate Colloquium; Valparaiso University (Valparaiso, Indiana); February 5, 2002.
  • "Circumellipses"; Undergraduate Colloquium; Valparaiso University (Valparaiso, Indiana); April 17, 2001.
  • "Curves of Constant Width"; Undergraduate Colloquium; Valparaiso University (Valparaiso, Indiana); October 17, 2000.
  • "Constructing Planar Regions with Maximal Distance d(P,Q)"; Indiana Section MAA Meeting; Earlham College (Richmond, Indiana); April 8, 2000.

• 2023-2024
  • (*) "Creating a classroom environment that empowers students to learn independently: Fostering Curiosity \& Self-Directed Learning via Scaffolding"; Project NExT panel; Mathfest (Indianapolis, Indiana); August 7, 2024. (slides)
• 2022-2023
  • (*) "Jumpstarting Undergraduate Research: How to find funding for your undergraduate research"; Project NExT panel; Joint Mathematics Meetings (Boston, Massachusetts); January 5, 2023. (slides)
• 2019-2020
  • (*) "Future Directions in Education"; Three Decades of DIMACS: The Journey Continues (New Brunswick, New Jersey); November 22, 2019.
  • (*) "Choosing Problems for Undergraduate Research"; Undergraduate Research SIGMAA panel; Mathfest 2019 (Cincinnati, Ohio); August 3, 2019.
• 2018-2019
  • (*) "Engaging Students in Undergraduate Research: The Role of Effective Advising"; Project NExT panel; Mathfest 2018 (Denver, Colorado); August 1, 2018. (slides)
• 2017-2018
  • (*) "CUPM Recommendations 3 and 5 at Valpo"; Section NExT panel; Indiana Section fall MAA meeting; Manchester University (North Manchester, Indiana); October 7, 2017. (slides)

• "Special Session on Enumerative Combinatorics and Graph Theoretic Applications" (co-organized with Adam Goyt); AMS Central Fall 2015 Sectional Meeting (Chicago, IL); October 3-4, 2015. (official page) (unofficial page)

• 2023-2024
  • "A wild journey toward Sabbath restoration"; Morning prayer homily; Chapel of the Resurrection (Valparaiso, Indiana); April 22, 2024. (livestream video)
• 2022-2023
  • (*) "My favorite verse"; Morning prayer homily; Chapel of the Resurrection (Valparaiso, Indiana); April 10, 2023. (livestream video) (audio recording) (manuscript)
• 2021-2022
  • "MathPath and Its Indiana Connections" (joint with Matt DeLong, Marian University); Indiana Section fall MAA meeting; Indiana Wesleyan University (Marion, Indiana); April 9, 2022.
• 2017-2018
  • (*) "Mathematics as Play"; Mortar Board Last Lecture; Valparaiso University (Valparaiso, Indiana); February 12, 2018. (slides)
• 2016-2017
  • (*) "Math and life together"; Morning prayer homily; Chapel of the Resurrection (Valparaiso, Indiana); September 5, 2016. (recording)
• 2012-2013
  • (*) "What is a Mathematician?"; 6th, 7th, and 8th grade guest speaker; Immanuel Lutheran School (Memphis, Tennessee); December 18, 2012. (slides)
  • (*) "What is a Mathematician?"; Discoveries Unlimited Speaker's Bureau presentation; Valparaiso University (Valparaiso, Indiana); October 18, 2012. (slides)
• 2010-2011
  • "The Valpo Path to Success"; Valparaiso Scholarship Day 2011 Mathematical Sciences presentation; Valparaiso University (Valparaiso, Indiana); February 18, 2011. (slides)
• 2009-2010
  • "The Valpo Path to Success"; Valparaiso Scholarship Day 2010 Mathematical Sciences presentation; Valparaiso University (Valparaiso, Indiana); February 6, 2010. (slides)
• 2007-2008
  • "Dealing with Different Levels of Academic Preparation"; Rutgers TA Project Workshop; Rutgers University (Piscataway, New Jersey); February 13, 2008. (slides)
  • (*) "What is a Mathematician?"; 8th grade guest speaker; Immanuel Lutheran School (Memphis, Tennessee); January 11, 2008.
  • "Assessment and Feedback"; Introduction to College Teaching 2 lecture (joint with Esther Leibovich, Rutgers Ecology & Evolution Department); Rutgers University (Piscataway, NJ); November 14, 2007. (slides)
  • "Designing Creative Assignments"; Introduction to College Teaching 2 lecture (joint with Colleen Kennedy, Rutgers French Department); Rutgers University (Piscataway, NJ); October 31, 2007. (slides)
• 2006-2007
  • "Dealing with Different Levels of Academic Preparation"; Rutgers TA Project Workshop; Rutgers University (Piscataway, New Jersey); February 21, 2007.
• 1999-2003 (undergraduate talks)
  • "REUs -- Everything You Could Possibly Want to Know About Them and More!!!"; Undergraduate Colloquium; Valparaiso University (Valparaiso, Indiana); December 11, 2001.