Ryan Anderson is a co-author of What Is Marriage? Man and Woman: A Defense, and the William E. Simon Fellow at the Heritage Foundation.
This is the Video of the lecture Ryan Anderson gave at Stanford earlier this spring has now become available.
You can watch a 3 minute highlight reel here: https://www.youtube.com/watch?v=xSRTUp1HRT4
The entire lecture is here: https://www.youtube.com/watch?v=YWIhZ5xJJaQ
And the entire Q&A is here: https://www.youtube.com/watch?v=VEsHpmQBfvo
The Heritage Foundation pulled out two particularly engaging exchanges in the Q&A here: http://dailysignal.com/2014/07/25/ryan-t-anderson-responded-gay-man-wants-redefine-marriage/