---2009---

MIT-Harvard joint Algebraic Geometry Seminar (Cambrdige, MA 2009), Schemic Grothendieck rings, arc integrals, and motivic rationality.

OSU Algebraic Geometry Seminar (Columbus, OH 2009), Schemic Grothendieck rings, arc integrals, and motivic rationality.

UMich Commutative Algebra Seminar (Ann Arbor, MI 2009), Schemic Grothendieck rings, arc integrals, and motivic rationality (abstract).

Algebra Seminar (Leuven, Belgium 2009), Schemic Grothendieck rings, arc integrals, and motivic rationality.

OSU Logic Seminar (Columbus, OH 2009), Tutorial lectures on schemic Grothendieck rings and motivic Igusa zeta series (abstract).

CUNY Logic Workshop (NY, NY 2009), Schemes as formulas: algebraic geometry for the logician (abstract).

Colloquiumfest (NY, NY 2009), Prolegomena to singular valuations (abstract).

Rutgers Logic Seminar (New Brunswick, NJ 2009), Schemic Grothendieck rings and motivic series.

Einstein Institute Logic Seminar (Jeruzalem, Israel 2008), Schemic Grothendieck rings and motivic series.

CUNY/Rutgers Commutative Algebra and Algebraic Geometry Seminar (New Brunswick, NJ 2008), Why the multiplicity of the cusp singularity x^2=y^3 is equal to 1+1/3+2/3.

McMaster Model Theory Seminar (Hamilton, ON 2008), Schemic Grothendieck rings and motivic series (abstract).

Regional AMS meeting, special session ‘Model Theory and its applications’ at Wesleyan Univ. (Middletown, CT 2008), Schemic Grothendieck rings (abstract).

Ohio State-Denison Mathematics Conference (Columbus, OH 2008), Weighted Grothendieck group.

CUNY Logic Workshop (NY, NY 2008), A reformulation of resolution of singularities in terms of cata-limits (abstract).

CUNY Commutative Algebra and Algebraic Geometry Seminar (NY, NY 2008), Tight closure, an introduction.

CUNY Logic Workshop (NY, NY 2008), Euler characteristics, Grothendieck groups, and motivic integration: some sophisticated ideas from algebraic geometry penetrating model-theory? (abstract)

OU-OSU Ring Theory Seminar (OSU, OH 2007), Quasi-Frobenius neighbors of an Artinian ring: preliminary report.

Mathematics Seminar Series (City Tech, OH 2007), Ultraproducts in algebra.

Regional AMS meeting, special session ‘Commutative Algebra’ at Rutgers Univ. (New Brunswick, NJ 2007), Characterizing ring properties through uniform behavior.

OU-OSU Ring Theory Seminar (OSU, OH 2007), Quantified versions of some ring properties.

CUNY Logic Workshop (NY, NY 2007), Computably categorical fields via Fermat's Last Theorem (abstract)

OSU Logic Seminar (OSU, OH 2007), A smooth classification problem in algebraic geometry: germs of points up to analytic isomorphism.

OU-OSU Ring Theory Seminar (OSU, OH 2006), Noetherianity criteria for coherent local rings.

Summer school on valuation theory and integral closure at Univ. of Ottawa (Ottawa, Canada 2006), The average of a valuation on a Noetherian ring.

Ohio State-Denison Mathematics Conference (Columbus, OH 2006), Ideal theory in local rings of finite embedding dimension.

Kolchin Seminar at Hunter College, (NY, NY 2006), Jetspaces.

OSU Algebraic Geometry Seminar (OSU, OH 2006), Classification of singularities up to analytic extension of scalars.

Univ. of Michigan Commutative Algebra Seminar (Ann Arbor, MI 2006), The Improved New Intersection Theorem holds asymptotically in mixed characteristic.

CUNY Logic Workshop (NY, NY 2006), Ring properties via uniform bounds (abstract).

OU-OSU Ring Theory Seminar (OSU, OH 2006), Order dimension of a Noetherian ring.

NYC Logic Conference (NY, NY 2005), Morley dimension.

CUNY Logic Workshop (NY, NY 2005), A sheaf theoretical/categorical approach to first-order logic.

Spring Lecture Series at the University of Arkansas (Fayetteville, AR 2005), Pure subrings of regular rings are pseudo-rational.

CUNY Logic Workshop (NY, NY 2005), Morley rank in algebraic geometry.

CUNY Logic Workshop (NY, NY 2004), A classification space for singularities.

CUNY Logic Workshop (NY, NY 2004), Ultraproducts and first-order theories of Noetherian local rings.

Regional AMS Meeting, special session 'Commutative Algebra and Algebraic Geometry' (Lawrenceville, NJ 2004), Applications of the purity of non-standard Frobenius.

Regional AMS Meeting, special session 'Theory of Rings and Modules' (Athens, OH 2004), Local rings of finite embedding dimension.

OU-OSU Ring Theory Seminar (OSU, OH 2004), Ultraproducts of Noetherian local rings.

NYCCT Math. Colloquium (NY, NY 2004), An undergraduate proof of the Tarski-Seidenberg Theorem.

XXIIth  SLALM (San Jose, Costa Rica 2004), The existential theory of Lefschetz rings with applications to commutative algebra.

CUNY Logic Workshop (NY, NY 2003), Maps and existential theories.

Commutative Algebra: Presentations by Young Researchers (UT 2003), The use of non-standard Frobenius in commutative algebra.

Algebraic Geometry Seminar (OSU, OH 2003), The Cohen-Macaulay property of quotient singularities in mixed characteristic.

OU-OSU Ring Theory Seminar (OSU, OH 2003), Singularity theory beyond the Noetherian realm.

Algebraic Geometry Seminar (OSU, OH 2003), Log-terminal singularities and vanishing theorems.

Model Theory Seminar (Berkeley, CA 2002), Mixed characteristic homological theorems in low degrees.

MSRI Algebra Seminar (Berkeley, CA 2002), Tight closure and big Cohen-Macaulay algebras in characteristic zero using ultraproducts.

Logic Seminar at Wesleyan (Middletown, CT 2002), Difference rings and the Hochster-Roberts Theorem on rings of invariants.

CUNY Arithmetical Geometry Seminar (New York, NY 2002), The Frobenius in characteristic zero and its use in commutative algebra and singularity theory.

Logic Seminar at Rutgers (New Brunswick, NJ 2002), The Ax-Kochen-Ershov Principle and Asymptotical Homological Conjectures (abstract).

Bronx Comm. Coll. Colloquium (Bronx, NY 2002), An undergraduate proof of the Tarski-Seidenberg Theorem.

Rutgers Commutative and Computational Algebra Seminar (New Brunswick, NJ 2002), Balanced big Cohen-Macaulay Algebras.

CUNY Logic Workshop (New York, NY 2002), Gauges, ultraproducts and uniform bounds (abstract).

CUNY Logic Workshop (New York, NY 2002), Non-standard methods for proving Briancon-Skoda (abstract).

Rutgers Commutative and Computational Algebra Seminar (New Brunswick, NJ 2002), Betti Numbers of the Absolute Integral Closure.

Lecture series on Rigid analytic geometry at Paris VII (Paris, France 2002).

Logic Seminar (Paris, France 2002), Non-standard methods in commutative algebra.

Algebraic Geometry Seminar (OSU, OH 2002), The constructible nature of singularity defects.

Ohio State-Denison Mathematics Conference (Granville, OH 2002), Big Cohen-Macaulay Algebras (abstract).

Algebra Seminar at Univ. of Minnesota (Minneapolis, MN 2002), The use of non-standard Frobenius in tight closure.

Midwest Model Theory Conference (Chicago, IL 2002), Lefschetz categories, the Ax-Kochen-Ershov Principle and transfer from prime to mixed characteristic (abstract).

OU-OSU Ring Theory seminar (Columbus, OH 2002), Deformational Local Algebra (abstract).

OSU Algebraic Model Theory seminar (Lima, OH 2002), The use of non-standard Frobenius in local algebra(abstract).

Model Theory Conference (Birmingham, UK 2002), The use of non-standard Frobenius in tight closure theory(abstract).

Algebraic Geometry Seminar (OSU, OH 2002), Quotient singularities are rational.

AMS Meeting, special session 'Set Theory and Classification Problems' (San Diego, CA 2002), Existential Lefschetz Principles for Power Series Rings and Artin Approximation.

Algebra Seminar (Leuven, Belgium 2001), Non-standard tight closure and the Hochster-Roberts theorem.

Model Theory Seminar (Berkeley, CA 2001), The use of the non-standard Frobenius in tight closure.

OU-OSU Ring Theory Seminar (Lima, OH 2001), The completion of a flat module.

Regional AMS Meeting, special session 'Commutative Algebra' (Columbus, OH 2001), Non-standard tight closure and symbolic powers.

Rutgers Commutative and Computational Algebra Seminar (New Brunswick, NJ 2001), A non-standard tight closure proof of the Hochster-Roberts Theorem.

Summer AMS-SMF Meeting (Lyon, France 2001), Application of the Ax-Kochen principle to power series with integer coefficients.

IPM Algebra Seminar (Tehran, Iran 2001), Non-standard tight closure.

IPM Logic Seminar (Tehran, Iran 2001), Cell Decomposition in t-minimal structures.

Meeting of CMS (Saskatoon, Canada 2001), Determining the number of equations of an affine curve.

Commutative Algebra Conference (Columbia, MO 2001), How the singular locus determines the category of finitely generated modules.

ASL Conference at Upenn (Philadelphia, PA 2001), Cell Decomposition in Tame Topologies.

Logic Seminar at Rutgers (New Brunswick, NJ 2001), Non-standard Tight Closure.

Rutgers Commutative and Computational Algebra Seminar (New Brunswick, NJ 2001), Effective bounds on the number of defining equations on surfaces.

Logic Seminar at Rutgers (New Brunswick, NJ 2000), Symbolic powers and the Lefschetz principle.

Logic Seminar at Rutgers (New Brunswick, NJ 2000), On the decidability of the existential theory of $\mathbb F_p[[t]]$.

Friday Seminar at CUNY (New York, NY 2000), Tame Topology and t-minimality.

Logic Seminar at OSU (Columbus, OH 2000), Definability, Uniformity and Transfer. A logician's view on algebra and geometry.

Logic Seminar at Rutgers (New Brunswick, NJ 2000), lecture series on Asymptotical definability in algebra.

Oberwolfach Model Theory Meeting (Oberwolfach, Germany 2000), Constructible Invariants.