Watch my TED talk on why dark matter matters!

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Here I describe what the universe is made of in just 3 minutes! For a longer more detailed version, see Mapping the Cosmos, an hour long chalk talk and discussion at the Kavli Institute for Theoretical Physics (Spring 2017), or Mapping the Dark Cosmos, a public talk at the Aspen Center for Physics (Summer 2018),

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I discussed what we know and don't know about dark matter with Brian Greene and others at the World Science Festival in May 2019.
The full discussion is about 80 minutes.

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Public Lecture at the Royal Institution with Adam Riess, Renee Hlozek, and me (I start talking about "Tracing the Dark Universe with Galaxies" around minute 25, followed by Q&A moderated by Lucie Green, July, 2015

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My 7 minute TEDxYouth talk, given for a great group of students at Castilleja High School, 2010

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other recent lectures

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• Physics in the Dark: A Search for the Universe's Missing Matter, World Science Festival, May 2019
• Mapping the Dark Universe with Galaxy Surveys, Aspen Center for Physics, August 2018
• Science Sundays Public Lecture, Ohio State University, November 17, 2013
• Frontiers of Astronomy, Cleveland Museum of Natural History November 14, 2013
• Galaxy Formation in Dark Universe, San Francisco Amateur Astronomy Society, Randell Museum, San Francisco, October 2012​​
• Dark Matter: The Search for 85% of the Mass in the Universe, Heinz Pagels Lecture, Aspen, August 2011
• Understanding Dark Matter, Kavli Frontiers of Science, 2009 [video here]
• Dark Energy: What the...? SLAC Public Lecture, October 2007 [video here] see especially the earthshaking moment @ min 34.​