Upcoming conferences and seminars
 University of Southern California combinatorics seminar, fall 2020 (exact date TBD).
 Simon Fraser combinatorics seminar, fall 2020 (exact date TBD).
 ICERM workshop on Symmetry, Randomness, and Computation in Real Algebraic Geometry, Providence, RI, August 2428, 2020.
Slides from recent/selected talks
 Plenary speaker (two one hour talks), 51st Southeastern Conference in Combinatorics, Graph Theory, and Computing, Boca Raton, FL, March 913, 2020 ( slides from first talk and slides from second talk).
 Oregon Algebra/Combinatorics Seminar, February 11, 2020.

Oberwolfach Workshop on Geometric, Algebraic, and Topological Combinatorics, Oberwolfach Germany, August 2531, 2019.

Duke University SWIM 2019 Summer Math Program for Women, Guest Lecture, Durham NC, June 24, 2019.
 UC Irvine Math Department Colloquium, March 14, 2019 (slides on ``Fibers of maps to totally nonnegative spaces'' ).
 University of Oregon Math Department Colloquium, Eugene, OR, January 28, 2019 (slides on ``Fibers of maps to totally nonnegative spaces and the FominShapiro Conjecture'' ).
 University of Oregon Joint Combinatorics/Topology Seminar, Eugene, OR, December 6, 2018 (slides on ``Posets arising as 1skeleta of simple polytopes, the nonrevisiting path conjecture, and poset topology'' ).
 Combinatorics and beyond: the many facets of Sergey Fomin's mathematics one hour invited conference talk, Ann Arbor, MI, November 811, 2018 (slides on ``Fibers of maps to totally nonnegative spaces and the FominShapiro Conjecture'').
 Notre Dame Math Department Colloquium, October 3, 2018 (slides on ``Combinatorics and topology of totally nonnegative spaces'').

WINRS Conference 20 minute invited talk, Charlottesville, VA, September 15, 2018 (slides on ``Posets arising as 1skeleta of simple polytopes, the nonrevisiting path conjecture and poset topology'').
 ICM Satellite Conference 45 minute invited talk, University of Miami, July 2629, 2018 on ``Topology and combinatorics of totally nonnegative spaces''.
 2018 Cumberland Conference (one hour plenary talk), Huntington, WV, May 1920, 2018
(slides on ``Posets arising as 1skeleta of simple polytopes, diameter bounds on polytopes and poset topology'' ).
 Cornell Discrete Geometry and Combinatorics Seminar, May 7, 2018
(slides on ``Posets arising as 1skeleta of simple polytopes, the nonrevisiting path conjecture and poset topology'').
 Helen Barton Distinguished Lecture, UNC Greensboro, April 6, 2018
(slides on ``From poset topology to combinatorial representation theory'').
 Joint Math Meetings Special Session on
``Special Functions and Combinatorics'' in honor of Dennis Stanton, San Diego, CA, January 1013, 2018
(slides on ``Posets from Polytopes'').
 Notre Dame Cluster Algebras Seminar, November 27, 2017
(slides on ``Crystal graphs and SBlabelings'').
 MSRI Connections for Women Workshop: Geometric and Topological Combinatorics, Berkeley, CA, August 31September 1, 2017
(slides on ``Shellability of uncrossing posets and the CW poset property'').
 AIM Workshop on Topology of the Biomolecular World, San Jose, CA, July 2428, 2017
(slides on ``Discrete Morse theory for poset order complexes'').
 Algebraic and Geometric Combinatorics of Reflection Groups Conference, University of Montreal, Montreal, June 59, 2017, ``Shelling Bruhat order and the proof of a conjecture of Thomas Lam''.
 University of British Columbia Topology and Related Fields Seminar, February 15, 2017
(slides on ``Representation stability in configuration spaces via Whitney homology of the partition lattice'')  talk also given in ICERM Workshop (November 28December 2, 2016).
 University of Washington Math Department Colloquium, February 10, 2017 (slides on ``Poset topology meets combinatorial representation theory'').
 University of Southern California Math Department Colloquium, February 8, 2017 (slides on ``Crystal graphs and SBlabelings'')  talk also given at Indiana University Combinatorics Seminar (April 4, 2017), UCLA Combinatorics Seminar (February 7, 2017), Cornell Discrete Geometry and Combinatorics Seminar (January 30, 2017), MIT Combinatorics Seminar (October 12, 2016) and Brown Discrete Math Seminar (October 11, 2016).
 ICERM Minicourse on Topological Combinatorics of Posets and Stratified Spaces, Nov. 7, 11, and 14, 2016 (during sabbatical semester at ICERM).
(1st lecture slides) (2nd lecture slides) (3rd lecture slides)
 AMS Eastern Sectional Meeting, Special Session on Combinatorial Aspects of Nilpotent Orbits (45 minute invited talk), Brunswick, ME, September 2425, 2016,
(slides on ``From the weak order to crystal graphs as posets'')  talk also given at Joint Math Meetings Algebraic Combinatorics AWM Workshop (January 69, 2016, Seattle, WA) and Southeast Lie Theory Meeting (October 911, 2015, Raleigh, NC).
 Duke University SWIM 2016 Summer Math Program for Women, Guest Lecture, Durham, NC, June 20, 2016
(slides on ``Combinatorics meets topology: Möbius function, Euler characteristic, and beyond'').
 University of Chicago Minicourse on Topological combinatorics of posets and stratified spaces (3 lectures), during U. Chicago one month visit (March 512, 2016 and May 17June 10, 2016).
(1st lecture slides) (2nd lecture slides) (3rd lecture slides)
 Cornell Topology Festival, Ithaca, NY, May 1116, 2016
(slides on ``Representation stability and S_n module structure in the homology of the partition lattice'').
 University of Illinois at Chicago Algebraic Geometry Seminar Talk, March 7, 2016 (slides on ``Regular cell complexes in total positivity'') during U. Chicago one month visit (March 512, 2016 and May 17June 10, 2016).

University of Minnesota Combinatorics Seminar (held in the Student Combinatorics Seminar as 75 minute talk, December 10, 2015, Minneapolis MN): From the weak Bruhat order to crystal posets.

Brown University Math Department Colloquium (February 23, 2015, Providence RI): Combinatorics and topology of totally positive spaces.
 Combinatorial algebra meets algebraic combinatorics Conference Plenary Talk (January 2325, 2015, Kingston, Ontario, Canada): Regular cell complexes in total positivity.
 Wachsfest Conference One Hour Invited Talk (January 6, 2015, Miami FL): Representation stability in the partition lattice. Includes some additional material not in the earlier talks below on this topic.
 Stanford University Topology Seminar (December 2, 2014): Regular cell complexes in total positivity  talk also given in U. Chicago geometry/topology seminar (November 18, 2014).
 Stanford University Representation Stability Seminar (December 2, 2014): Representation stability and S_nmodule structure in the partition lattice  talk also given at Wisconsin Combinatorics Seminar (November 3, 2014).
 Survey talk on Discrete Morse Theory (Oct. 30, 2014, IMA, U. Minnesota, Minneapolis MN, Program on Discrete Structure: Analysis and Applications) Discrete Morse theory from a matching theoretic perspective.
 A Conference Honoring Richard Stanley (June 26, 2014, MIT, Cambridge MA):
Posets with each interval homotopy equivalent to a ball or sphere.
 IMA Invited Conference Talk (April 29, 2014):
Topology and combinatorics of generically injective maps.
 Berkeley Combinatorics Seminar (March 10, 2014): Regular cell complexes in total positivity. With extra slides at the end as an appendix giving indications of some more technical details. Very similar (but not identical) to UCLA talk.
 UCLA Combinatorics Seminar (December 12, 2013): Regular cell complexes in total positivity. With extra slides at the end as an appendix giving indications of some more technical details. Talk also given at Michigan Combinatorics Seminar (November 1, 2013).
 FPSAC Conference Plenary Talk (June 27, 2013, Paris, France): Topological combinatorics of Bruhat order and total positivity.
 ICERM 45 Minute Invited Conference Talk (March 5, 2013, Providence, RI): Symmetric chain decomposition for cyclic quotients of Boolean algebras and relation to cyclic crystals  talk also given at
UNC Chapel Hill (Sept. 16, 2011), NCSU Seminar (August 26, 2011, U. Penn/Drexel (Oct. 18, 2011), Georgia Tech (Nov. 18, 2011), Michigan (March 30, 2012), and a shorter version at AMS sectional meeting at George Washington University (March 17, 2012).
 AMS Southeastern Sectional Meeting One Hour Invited Address (March 1, 2013, Oxford, MS): ``An Interplay of Combinatorics with Topology''.
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