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The influence of inhomogeneities on the large-scale expansion of the universe,
University of Sussex, Cosmology Seminar, October 8, 2010.

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A few unanswered questions about the inflationary picture,
ESQG 2010, NORDITA, Stockholm, July 12–16, 2010, Invited Talk.

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Enhancing non-Gaussianities by breaking local Lorentz invariance,
Lancaster University, Cosmology and High Energy Physics Seminar, November 27, 2009.

[pdf]

Enhancing non-Gaussianities by breaking local Lorentz invariance,
PASCOS 2009, DESY, Hamburg, July 6–10, 2009, Parallel Session Talk.

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Enhancing non-Gaussianities by breaking local Lorentz invariance,
The Invisible Universe International Conference, Palais de l’UNESCO, June 29–July 3, 2009, Parallel Session Talk.

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Testing the inflationary picture,
Particle Physics and Cosmology: From the Smallest Scales to the Largest, Nordic Researcher Networks Meeting, Niels Bohr International Academy, April 1–3, 2009, Parallel Session Talk.

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Trans-Planckian relics in the scalar to tensor ratio,
The Second UniverseNet Meeting, Seeking Links between Fundamental Physics and Cosmology, University of Oxford, September 22–26, 2008, Parallel Session Talk.

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Unparticles and inflation,
Lund University, High Energy Physics Seminar, May 15, 2008.

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Unparticles and inflation,
The Niels Bohr Institute, The NBIA workshop on Field Theory and Cosmology, March 27, 2008.

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Effective theory approaches to the trans-Planckian problem,
The Niels Bohr Institute, Theoretical Particle Physics and Cosmology Seminar, February 5, 2008.

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Cosmic signals from the breaking of local Lorenz invariance,
University of Massachusetts, High Energy and Nuclear Seminar, May 11, 2007.

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Ripples in the cosmos,
Columbia University, Graduate Student Seminar, March 23, 2007.

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The light from beyond the stars,
Columbia University, Undergraduate Seminar, March 22, 2007.

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Seeking finer structures in the CMB: An effective theory for an initial state of inflation,
Los Alamos National Laboratory, T-8 Theory Seminar, February 26, 2007.

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Seeking finer structures in the CMB: An effective theory for an initial state of inflation,
University of South Carolina, Physics Colloquium, February 6, 2007.

[pdf]

Ripples in the cosmos,
University of Buffalo, Physics Colloquium, January 30, 2007.

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An effective theory of initial conditions in inflation,
PASCOS 2006, Ohio State University, September 10–15, 2006, Parallel Session Talk.

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The effective theory of an initial state,
Perimeter Institute Workshop, Natural Ultraviolet Cutoffs in Expanding Space-times, September 5–8, 2006.

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Energy-momentum divergences and the renormalization of gravity,
University of Massachusetts, High Energy Lunch Talk, April 4, 2006.

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An effective theory of initial conditions in inflation,
University of North Carolina, Chapel Hill, Cosmology Seminar, February 24, 2006.

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Beyond the big bang,
University of North Carolina, Chapel Hill, Colloquium, February 23, 2006.

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An effective theory of initial conditions in inflation,
New Views of the Universe, University of Chicago, December 12, 2005, Parallel Session Talk.

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An effective theory of initial conditions in inflation,
University of Toronto, High Energy Physics Seminar, November 14, 2005 and
Perimeter Institute, Cosmology Seminar, November 15, 2005.

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An effective theory of initial conditions in inflation,
University of Massachusetts, High Energy Lunch Talk, November 8, 2005.

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Renormalization of initial conditions and the trans-Planckian problem of inflation,
Frontiers in Contemporary Physics III, Vanderbilt University, May 23–28, 2005, Parallel Session Talk.

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Initial conditions and renormalization,
Virginia Tech, Particle Physics and Astrophysics Seminar, November 1, 2004.

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Initial conditions and propagation
COSMO-04, University of Toronto, September 17–21, 2004, Parallel Session Talk.

[pdf]

The taming of the α-vacuum,
PASCOS 2004, Northeastern University, August 16–22, 2004, Parallel Session Talk.

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Taming the α-vacuum,
University of Massachusetts, High Energy/Nuclear Seminar, May 14, 2004.

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The fate of the α-vacuum,
Fermilab, Theory Seminar, March 25, 2004 and
Purdue University, High Energy Theory Seminar, March 23, 2004.

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The fate of the α-vacuum,
Yale University, Particle Theory Seminar, February 5, 2004 and
Cornell University, Particle Theory Seminar, February 4, 2004.

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The fate of the α-vacuum,
University of Madison, String Theory Seminar, November 18, 2003.

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The fate of the α-vacuum,
Fermilab Workshop, de Sitter Days, November 13–15, 2003.

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The fate of the α-vacuum,
International Symposium on Quantum Theory and Symmetries, University of Cincinnati, September 10–14, 2003, Parallel Session Talk.

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The fate of the α-vacuum,
PHENO 2003 Symposium, University of Madison, May 5–7, 2003, Parallel Session Talk.

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Radion-induced brane preheating,
COSMO-02, Chicago, September 18–21, 2002, Parallel Session Talk.

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The Randall-Sundrum cosmology as brane dynamics in an AdS-S bulk,
Theory Institute 2002, Argonne National Laboratory, September 9–13, 2002.

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Radion-induced brane preheating,
Extra Dimensions and Beyond, Santa Fe 2002 Summer Workshop, August 4–10, 2002.

[pdf]

The Randall-Sundrum scenario with an extra warped dimension,
MRST 2001, University of Western Ontario, May 15–18, 2001.

[pdf]

The Randall-Sundrum scenario with an extra warped dimension,
PASCOS 2001, University of North Carolina Chapel Hill, April 9–14, 2001, Parallel Session Talk.

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Hiding a cosmological constant in a warped extra dimension,
Carnegie Mellon University, High Energy Theory Seminar, January 29, 2001.

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Hiding a cosmological constant in a warped extra dimension,
Argonne National Laboratory, Theory Seminar, January 22, 2001.

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The cosmological constant and warped extra dimensions,
University of Toronto, High Energy Physics Seminar, December 12, 2000.

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Brane cosmologies without orbifolds,
MRST 2000, University of Rochester, May 8–9, 2000.

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Brane cosmologies without orbifolds,
University of Toronto, High Energy Physics Seminar, April 20, 2000.