"The Impact of Engineers on Society: Differentiating Practical from Merely Possible", 2013 James R. Mellor Lecture at the University of Michigan, 8 February 2013.
2012 MIT EmTech
"The Future of Alternative Feedstocks and Biofuels: Recognizing Hype and Realizing Practical Limitations." from February 2012 at the University of California, Berkeley
