Below is a list of recent communications for which I have a digital copy. See my CV for a complete history.
Last modified: October 2018
Presentations 

 Rational series over free groups and the word problem.
UW Combinatorics Seminar, Madison, Wisconsin, December 2018.
[slides]
 Generalized JucysMurphy elements and canonical idempotents in Brauer algebras.
3rd Congress of the Pacific Rim Math. Assoc., Oaxaca, Mexico, August 2017.
[slides]
 Convolution powers of the identity in combinatorial Hopf algebras.
Midwest Combinatorics Conference, Minnesota, May 2015.
[slides]
 Hopf algebra structure of the ring of kSchur functions.
XX Coloquio Latinoamericano de Algebra, Lima, Peru, December 2014.
[slides]
 Measurings in graded connected Hopf algebras.
Meeting of the Atlantic Category Group, Halifax, October 2014.
[slides]
 Lagrange's theorem for Hopf monoids in species.
FPSAC'11, Iceland, June 2011.
[poster]
 QSym over Sym has a stable basis. (Graciously delivered by Christophe Reutenauer in my absence.)
LaCIM 2010: Miniconference in honor of LaCIM's 10th anniversary, Montreal, August, 2010.
[slides]
 Skew Littlewood–Richardson rules from Hopf algebras.
22nd International Conference on Formal Power Series and Algebraic Combinatorics, San Francisco, July, 2010.
[slides]
 Lagrange's theorem for Hopf monoids in species.
SIAM Conference on Discrete Mathematics, Austin, TX, June, 2010.
[slides]
 QSym over Sym has a stable basis.
AMS Sectional Meeting, Lexington, KY, March, 2010.
[slides]
 New Hopf structures on planar binary trees.
FPSAC'09, Austria, July 2009.
[poster]
 Nichols algebras in positive characteristic.
CMS Summer Meeting, St. John's, Newfoundland, June 2009.
[slides]
 Hopf structures on binary trees (variations on a theme).
AMS Section Meeting, Raleigh, NC, April 2009.
[slides]
 Rational and irrational series over the free group.
AMS Joint Meetings, Washington, D.C., January 2009.
[slides]
 New Hopf structures on planar binary trees.
CMS Winter Meetings, Ottawa, December 2008.
[slides]
 Invariant and coinvariant spaces for the algebra of symmetric polynomials in noncommuting variables.
20th International Conference on Formal Power Series and Algebraic Combinatorics, Valparaiso, Chile, June, 2008.
[slides]
 On matrix inversion using mixed information.
AMS Sectional Meeting, Baton Rouge, LA, March, 2008.
[slides]
 The Markoff condition and central words.
AMS/MAA Joint Meetings (YMN Poster Session), San Diego, CA, January 2008.
[poster]
 Yangian flags via quasideterminants.
Advanced Course on Quasideterminants and Universal Localization, CRM, Barcelona, Spain February, 2007.
[slides]
 POset paths and qcommuting minors.
Séminaire de combinatoire et d'informatique mathématique, LaCIMUQAM, Montréal, April 2006.
[slides]

Publications 

Journal articles 
 (with S. Doty, G.H. Seelinger) Canonical idempotents of multiplicityfree families of algebras.
l'Enseignement Math., to appear.
[preprint]
 (with M. Aguiar) The characteristic polynomial of the Adams operators on graded connected Hopf algebras.
Alg. Number Theory, 9 (2015), no. 3, 547–583.
[preprint]
 (with T. Hangelbroek) The polyharmonic Dirichlet problem and path counting.
J. Math. Pures Appl. (9), 102 (2014), no. 3, 449–481.
[preprint]
 (with M. Konvalinka) Skew Pieri rules for HallLittlewood functions.
J. Alg. Comb., 17 (2013), no. 3, 499–518.
[preprint]
 (with S. Forcey & F. Sottile) Cofree compositions of coalgebras.
Ann.Comb.,SpecialIssue: 10 years of BAD Math, 17 (2013), no. 1, 105–130.
[preprint]
 (with M. Aguiar) Lagrange's theorem for Hopf monoids in species.
Canad. J. Math., 65 (2013), no. 2, 241–265.
[preprint]
 (with S. Mason) QSym over Sym has a stable basis.
J. Combin. Theory Ser. A, 118 (2011), 1661–1673.
[preprint]
 (with M. Mastnak) The primitives and antipode in the Hopf algebra of symmetric functions in noncommuting variables.
Adv. Appl. Math., 47 (2011), no. 3, 536–544.
[preprint]
 (with F. Bergeron) Invariant and coinvariant spaces for the algebra of symmetric polynomials in noncommuting variables.
Electron. J. Combin. 17 (2010), no. 1, article R166.
[preprint]
 Quasideterminants and qcommuting minors.
Glasgow Math. J. 52 (2010), no. 3, pp.663–675.
[preprint]
 (with S. Forcey & F. Sottile) Hopf structures on the multiplihedra.
SIAM J. Discrete Math., to appear.
[preprint]
 (with T. Lam & F. Sottile) Skew LittlewoodRichardson rules from Hopf algebra.
Int. Math. Res. Not., to appear.
[preprint]
 (with C. Cibils & S. Witherspoon) Hopf quivers and Nichols algebras in positive characteristic.
Proc. Amer. Math. Soc. 137 (2009), no.12, pp.4029–4041.
[preprint]
 (with A. Glen & F.V. Saliola) A note on the Markoff condition and central words.
Inform. Process. Lett. 105 (2008), no.6, pp.241–244.
[preprint]
 (with E.J. Taft) A class of left quantum groups modeled after $SL$q(n).
J. Pure Appl. Algebra 208 (2007), no. 3, pp.797–803.
[preprint]
 Quantum and quasiPlücker coordinates.
J. Algebra, 296 (2006), no. 2, pp.440–461.
[preprint]

Proceedings, Books, Collections 
 (with M. Mastnak) Bialgebra coverings and transfer of structure.
In: Tensor categories and Hopf algebras. Edited by N. Andruskeiwitch and D. Nikshych.
Contemporary Mathematics, ##. AMS, Providence, RI, to appear.
[preprint]
 (with C. Reutenauer) Rational series in the free group and the Connes operator.
In: Noncommutative Birational Geometry, Representations and Combinatorics. Edited by A. Berenstein and V. Retakh.
Contemporary Mathematics, 592. AMS, Providence, RI, 2013, pp. 177–197.
[preprint]
 (with M. Aguiar) Antipode and convolution powers of the identity in graded connected Hopf algebras.
25th Annual FPSAC Conference (Paris, France, 2013), DMTCS Proceedings.
[preprint]
 (with M. Konvalinka) Skew Pieri rules for HallLittlewood functions.
24th Annual FPSAC Conference (Nagoya, Japan, 2012), DMTCS Proceedings.
[preprint]
 (with M. Aguiar) Lagrange's theorem for Hopf monoids in species.
23nd Annual FPSAC Conference (Reykjavik, Iceland, 2011), DMTCS Proceedings.
[preprint]
 (with S. Mason) QSym over Sym has a stable basis.
22nd Annual FPSAC Conference (San Francisco, 2010), DMTCS Proceedings.
[preprint]
 (with T. Lam & F. Sottile) Skew Littlewood–Richardson rules from Hopf algebras.
22nd Annual FPSAC Conference (San Francisco, 2010), DMTCS Proceedings.
[preprint]
 (with S. Forcey & F. Sottile) New Hopf structures on binary trees.
21st Annual FPSAC Conference (Hagenberg, Austria, 2009), DMTCS Proceedings.
[preprint]
 (with F. Bergeron) Invariant and coinvariant spaces for the algebra of symmetric polynomials in noncommuting variables.
20th Annual FPSAC Conference (Valparaiso, Chile, 2008), DMTCS Proceedings.
[preprint]
 (with J. Berstel, C. Reutenauer, F.V. Saliola) Combinatorics on words: Christoffel words and repetitions in words.
CRM Monograph Series, v.27, Amer. Math. Soc., 2009
[preprint]
 (with D.F. Anderson, A. Frazier, P.S. Livingston) The zerodivisor graph of a commutative ring, II.
Ideal theoretic methods in commutative algebra, pp.6172, Lecture Notes in Pure and Appl. Math., v.220, Dekker, 2001.
[preprint]
 A quasideterminantal approach to quantized flag varieties.
PhD thesis, Rutgers University, 2005.
[preprint]

