 Talk at POSTECH, Institute for Basic Science, Center for Geometry
and Physics, Pohang, South Korea, on March 8, 2017 on
``Introduction to quantum sheaf cohomology''
 Mentor/lecturer at Superschool on derived categories and Dbranes
(Edmonton, Canada, July 1723, 2016).
 Talk at (0,2) in
Paris (Paris, France, May 30June 3, 2016) on
Quantum sheaf cohomology.
 Talk at IPMU (Tokyo, Japan) on May 10, 2016, on
Recent developments in 2d (0,2) theories
 Talk at Homological mirror geometry (Banff, Canada, March 711, 2016) on
Heterotic mirror symmetry, and quantum sheaf
cohomology
 Talk at Geometry in gauge theories and string theory (Korea
Institute for Advanced Studies, Seoul, South Korea, September 1518,
2015) on Recent developments in 2d (0,2) theories
 Talk at University of California Berkeley on May 12, 2015,
on Recent developments in 2d (0,2) theories
 Talk at University of California Davis on May 11, 2015,
on Chiral rings in 2d (0,2) theories
 Talk at University of TexasAustin, math department on April 1, 2015,
on An introduction to quantum sheaf cohomology.
 Talk at University of TexasAustin, physics department,
on March 31, 2015, on
Recent developments in 2d (0,2) theories
 Talk at special session on mirror symmetry
at fall southeastern
sectional AMS meeting (Greensboro, NC, November 89, 2014) on
An introduction to heterotic mirror symmetry
 Talk at Gauged
sigma models in two dimensions (Simons Center, Stony Brook, NY,
November 37, 2014) on Chiral rings in
2d (0,2) theories
 Talk at Exact results in
susy gauge theories in various dimensions (CERN, Switzlerand,
August 1122, 2014) on Duality in twodimensional
nonabelian gauge theories
 Talk at Universitat Bonn (Bonn, Germany) on July 29, 2014, on
Recent developments in 2d (0,2) theories
 Math/physics colloquium at AlbertLudwigsUniversitat (Freiburg, Germany)
on July 25, 2014, on An introduction to
mirror symmetry
 Talk at AlbertLudwigsUniversitat (Freiburg, Germany) on July 24, 2014,
on Sheaftheoretic analogues of MathaiQuillen forms.
 Math/physics colloquium at
Institute
for Theoretical Physics
(Heidelberg, Germany) on July 22, 2014
on An introduction to mirror symmetry
 Talk at Institute
for Theoretical Physics
(Heidelberg, Germany) on July 21, 2014
on Duality in twodimensional nonabelian
gauge theories
 Talk at HeriotWatt University (Edinburgh, Scotland) on July 18, 2014
on Recent developments in 2d (0,2) theories.
 Talk at StringMath 2014 (University of Alberta, Edmonton, Canada, June 913, 2014)
on Recent developments in 2d (0,2) theories.
 Talk at Heterotic strings and (0,2) QFT (Texas A&M, April 28 
May 2, 2014) on
Recent developments in 2d (0,2) theories
 Talk at University of Amsterdam on March 14, 2014, on
Quantization of FayetIliopoulos parameters
in supergravity.
 Talk at TU Wien
(physics) on March 10, 2014 on
Duality in twodimensional nonabelian
gauge theories.
 Two talks at Third
international satellite conference on Mathematical methods in physics
(Universidade Estadual de Londrina, Brazil, October 2126, 2013) on
Some new advances in gauged linear sigma models.
 Talk at Matrix
factorizations in algebra, geometry, and physics (Mathematisches
Forschungsinstitut Oberwolfach, Germany, September 26, 2013) on
Matrix factorizations and homological projective duality in
physics.
 Talk at Matrix factorizations (Erwin Schrodinger Institute, Vienna, Austria,
May 1317, 2013) on Examples of homological
projective duality in physics.
 Talk at Geometry and physics of gauged linear sigma models (University of
Michigan, March 48, 2013), on Predictions for
GromovWitten invariants of a noncommutative resolution.
 Talk at String theory and generalized geometries (Banff, Canada, December 27, 2012),
on Abelian GLSMs, gerbes, nc resolutions,
and homological
projectve duality (or see
here.
 Talk at Homological projective
duality and quantum gauge theory
(IPMU, Tokyo, Japan, November 1216, 2012) on
Abelian GLSMs, gerbes,
and homological projective duality.
 Talk at University of Michigan
(physics) on October 10, 2012 on
Quantization of FayetIliopoulos parameters
in supergravity
 Talk at University of Michigan
(math) on October 8, 2012 on
An introduction to quantum sheaf cohomology.
 Talk at Syzygies in algebraic geometry (Banff, Canada, August 1317, 2012) on
Boundary terms in 2d theories and matrix factorizations
(see here for video)
 Talk at City University
(London, Britain) on June 14,
2012 on An introduction to quantum sheaf
cohomology
 Talk at MaxPlanck
Institute for Physics (Munich, Germany)
on June 12, 2012 on Quantization of
FayetIliopoulos parameters in supergravity
 Talk at MaxPlanck
Institute for Physics (Munich, Germany)
on June 11, 2012 on An introduction to
quantum sheaf cohomology
 Talk at Institute for
Theoretical Physics
(Heidelberg, Germany) on June 8, 2012 on
Quantization of FayetIliopoulos parameters
in supergravity
 Talk at the Instituto de Ciencias
Matematicas (ICMAT) (Madrid, Spain) on
June 4, 2012
on An introduction to quantum sheaf cohomology (blackboard talk).
 Talk at Seventh
international conference on mathematical methods in physics (Rio de Janeiro,
Brazil, April 1620, 2012) on
Introduction to heterotic mirror symmetry
 Talk at University of Minnesota on February 24, 2012 on
An introduction to quantum sheaf cohomology
 Talk at Perimeter Institute (Waterloo, Canada) on November 23, 2011
on Moduli of heterotic string
compactifications
 Talk at SESAPS, October 2011, on Quantization
of FayetIliopoulos parameters in supergravity
 Ninehour lecture series on Derived categories in string theory
(Tsinghua University, Beijing, August 112, 2011)
 Talk at (0,2)
mirror symmetry and heterotic topological strings (Erwin Schrodinger
Institute, Vienna, Austria, June 2024, 2011) on June 22, 2011 on
An introduction to quantum sheaf
cohomology
 Talk at
String Vacuum Project meeting (University of Pennsylvania,
May 2325, 2011) on May 25, 2011 on
Discrete symmetries in string theory and
supergravity
 Talk at Stanford University on May 16, 2011 on
Quantization
of FayetIliopoulos parameters in supergravity
 Talk at Texas A&M on May 9, 2011 on
Quantization
of FayetIliopoulos parameters in supergravity
 Talk at SE regional mathematical string theory meeting (Duke,
April 2, 2011) on ``Quantization of FayetIliopoulos parameters in
supergravity''
 Talk at network meeting
New geometric and nongeometric vacua
in string theory (Imperial, London, February 12, 2011) on ``An introduction
to strings on gerbes''
 Talk at SPOCK meeting (Cincinnati, November 13, 2010) on ``Quantization
of FayetIliopoulos parameters in supergravity''
 Talk at
Categorical
methods in geometry and gauge theory (Tianjin, China, August 29  Sept 3,
2010) on An introduction to quantum sheaf
cohomology
 Coorganizer of Summer school
on mathematical string theory 2010
 Talk at CERN on June 8, 2010 on ``An overview of progress on quantum
sheaf cohomology''
 Talk at
Workshop on geometry and physics of the
LandauGinzburg model
(Grenoble, France, May 31  June 4, 2010) on
An overview of progress on
quantum sheaf cohomology
 Talk at Generalized Geometries workshop (Brandeis, March 2528, 2010)
on Quantum sheaf cohomology
 Talk at (0,2) mirror symmetry and heterotic GromovWitten invariants
(Banff, Canada, March 812, 2010) on
Quantum sheaf cohomology
 Talk at
WAGP 2009
(Maresias, Brazil, September 1418, 2009)
on
Atwisted LandauGinzburg models, gerbes,
and Kuznetsov's homological projective duality
 Opening talk at
(0,2) mirror symmetry and quantum sheaf cohomology
(MaxPlanckInstitut, Potsdam, August 1721, 2009)
on
An overview of progress towards
(0,2) mirror symmetry
 Talk at
Quantum theory and symmetries 6
(University of Kentucky, Lexington, July 2024, 2009)
on GLSMs, gerbes, and
Kuznetsov's homological projective duality
 Lectured and mentored at
Geometry of quantum
fields and strings (summer school, University of Pennsylvania,
June 820, 2009)
 Talk at
Topology, C* algebras, and
string duality (Texas Christian University, Fort Worth, TX, May 1822, 2009)
on LandauGinzburg models, gerbes, and
Kuznetsov's homological projective duality
 Talk at Austin (February 24, 2009) on
Atwisted LandauGinzburg models;
talk at Austin (February 25, 2009) on
GLSM's, gerbes, and Kuznetsov's homological
projective duality
 Talk at
Workshop on the
geometry and physics of the LandauGinzburg model (Clay Math
Institute, Boston, January 1216, 2009) on
Atwisted LandauGinzburg models, gerbes,
and Kuznetsov's homological projective duality
 Talk at
Workshop on Topology and Physics (Drexel University, September 89,
2008) on Heterotic mirror symmetry
 Talk at
Bundles, gerbes, and derived categories in string theory (Salamanca,
May 1416, 2008) and at the University of Pennsylvania (September 2008)
on ``GLSM's, gerbes, and Kuznetsov's homological
projective duality''
 Talk at Stanford University (March 2008), Berkeley (March 2008),
SPOCK IX meeting (Cincinnati, January 2008),
Texas A & M (November 2007), and the
Workshop on
recent developments in string effective actions and Dinstantons
(MaxPlanck, Munich,
November 1416, 2007) on ``Heterotic
swamplands?''
 Talk at Berkeley (March 2008) on ``GLSM's,
gerbes, and Kuznetsov's homological projective duality''
 Talk at the AMS Summer Research Conference 2007 on derived categories in mathematics and physics
(coorganizer),
on ``GLSM's, gerbes, and Kuznetsov's homological projective duality''
 Lectures at the
June 2007 Utah minicourse on derived categories (coorganizer)
 Talk at the Sowers theoretical
physics workshop 2007 (coorganizer)
on ``Recent developments in heterotic compactifications''
