Conference/Seminar Talks
 An Instability in the Standard Model of Cosmology Creates the Anomalous Acceleration without Dark Energy,
Plenary Address, Harvard, April 8, 2016; Colloquium ETH Zurich, Switzerland, March 24, 2015; Colloquium UCD Mechanical Eng., February 2015; Colloquium UCBerkeley, October 2014; Colloquium UCDavis Mathematics October 2014; Plenary Talk Conference in honor of Eitan Tadmore, May 2014.
 Summary
 Applied Mathematics vs Dark Energy,
Plenary Address, National Colloquia of the Brazilian Mathematical Society, Rio De Janeiro, Brazil, July 2015; Invited one hour talk, Spring Western Sectional Meeting of AMS, Special Session on Conservation Laws, April 18, 2015.
 Nonlineaer Resonance 19801995 with Eli Isaacson,
Invited hour talk, National Colloquia of the Brazilian Mathematical Society, Rio De Janeiro, Brazil, July 2015.
 Numerical Simulation of GR Shock Waves by a Locally Inertial Godunov Method with Dynamic Time Dilation, University of Wyoming, June 2010, (Workshop on Conservation Laws); Philadephia, August 2010 (SIAM Special Session on Numerical Relativity); Konstanz University, Germany October 2010 (Applied Math Seminar)
 Periodic Solutions of the Compressible Euler Equations, Gehring Professor, University of Michigan
Fall 2007 (2 seminar talks)
 Periodic Solutions of the Compressible Euler Equations, Gehring Professor, University of Michigan
Fall 2007 (Colloquium)
 Numerical ShockWave Cosmology,
New Orleans, January 2007
 ShockWave Cosmology  Inside a Black Hole,
Academy Public Lecture, Indian National Academy of Sciences, Bangalore, January 2006
 Locally Inertial Glimm Scheme for General Relativity,
Plenary Talk, Stonybrook, July 2004
 Introduction to ShockWaves and General Relativity,
Three Lectures, Cambridge University, July 2003
