**REFEREED CONFERENCE PRESENTATIONS**

Johnson, H. L., Olson, G., Gardner, A., Smith, A., & Wang, X. (2020, Jan). Cartesian graphs, covariational reasoning, and powerful positioning in college algebra. *Joint Mathematics Meetings, *Denver, CO.

Johnson, H. L., Olson, G., Gardner, A., Smith, A., & Wang, X. (2020, Jan). Implementing techtivities to promote students’ covariational reasoning in college algebra. *Joint Mathematics Meetings, *Denver, CO.

Gardner, A., & Smith, A, Olson, G., & Johnson, H. L. (2019, June): An asset based approach to analyzing college algebra students’ reasoning on graphing tasks. *National Inquiry Based Learning Conference, *Denver, CO.

Smith, A., Gardner, A., & Johnson, H. L. (2018, August) Techtivities: Help students see how graphs work. *Annual Meeting of the Colorado Council of Teachers of Mathematics*, Denver, CO.

Olson, G., Johnson, H. L., & Kalir, J. (2018, August). Implementing Desmos techtivities to promote students’ covariational reasoning. *2018 Math Fest Meeting of the Mathematical Association of America, *Denver, CO.

Johnson, H. L., Olson, G., Kalir, J., Gardner, A., & Smith, A. (2018, June): Questioning our questions in online math tasks: From soliciting answers to eliciting reasoning. *National Inquiry Based Learning Conference, *Austin, TX.

Olson, G., Johnson, H. L., Kalir, J., Gardner, A., & Smith, A. (2018, June): Two graphs are better than one: Techtivities for College Algebra. *National Inquiry Based Learning Conference, *Austin, TX.

Olson, G., Kalir, J., & Johnson, H. L. (2018, April). Desmos techtivities for the college algebra classroom. *2018 Meeting of the Rocky Mountain Section of the Mathematical Association of America*, Pueblo, CO.

**INVITED PRESENTATIONS**

Johnson, H. L. (2017, December). Promote students’ smooth covariational reasoning. *Mathematics Education Colloquium. *Tempe, AZ: Arizona State University.

Johnson, H. L. (2017, November). Networking theories to design techtivities to promote students’ covariational reasoning. *Universiteit Utrecht Freudenthal Institute Research Meeting*, Utrecht, Netherlands.

Johnson, H. L. (2017, October). Task design to promote students’ covariational reasoning: A multi-theoretic approach. *Universität Bremen Mathematisches Kolloquium*. Bremen, Germany.

Johnson, H. L. (2017, September). Networking theories to design dynamic computer environments to foster students’ quantitative and covariational reasoning. *Mathematics Education Research Colloquium*, Linköping, Sweden: Linköping University.

**SEMINARS/WORKSHOPS**

Johnson, H. L. (2018, April 17). *Global Math Department Webinar: Helping students see how graphs work *[Video]. Retrieved from: https://www.bigmarker.com/GlobalMathDept/Helping-Students-See-How-Graphs-Work?bmid=376c71a2106a