Presentations:

"Polynomials Non-negative on Strips and Half-strips," Real Algebraic Geometry, Universit de Rennes 1, France, June 20, 2011

"Polynomials Non-negative on Half-strips and Multiple Strips," Joint Mathematics Meetings, New Orleans, LA, January 7, 2011

"Positive Polynomials and Sums of Squares in R²," Clayton State University, Morrow, GA, November 23, 2010

"Polynomials Non-negative on Strips and Half-strips in the Plane," Southern Regional Algebra Conference, University of Louisiana at Lafayette, Lafayette, LA, October 16, 2010

"Representations of Polynomials Non-negative on Non-compact Subset of R²," AMS Joint Mathematics Meetings, San Francisco, CA, January 15, 2010

"Polynomials Non-negative on Non-compact Subsets of the Plane," Positivity, Valuations, and Quadratic Forms, Universitat Konstanz, Germany, October 1-6, 2009 

"Polynomials Non-negative on Non-compact Subsets Semialgebraic Sets," Algebra Seminar, Emory University, September 28, 2009

"Polynomials Non-negative on a Strip and a Half-strip," SIAM ACES Workshop, Emory University, February 7, 2009

Southeast Section meeting of the MAA, University of Alabama in Tuscaloosa, March 31-April 2, 2011

Linear Algebraic Groups and Cohomology, Emory University, May 16-20, 2007

2007 AMS Spring Southeastern Section Meeting, Davidson College, Davidson, NC, March 3-4, 2007

SIAM student chapters at Auburn University, Clemson University, Emory University and University of South Carolina (ACES) Workshop, Emory University, December 2-3, 2006

Workshops:

Linear Matrix Inequalities and Polynomial Optimization (LMIPO), University of California in San Diego, San Diego, CA, March 22-25, 2010