Paul G. Richards is an American seismologist and geophysicist specialized in the theory of seismic wave link propagation, the physics of earthquakes, monitoring underground nuclear explosions, and nuclear arms control. He is currently the Mellon Professor Emeritus of Natural Sciences at the Lamont-Doherty Earth Observatory of Columbia University. Richards has been involved in scientific studies on the verification of the CTBT since the Treaty's negotiations in the 1990s in Geneva. Richards spoke with the CTBTO at the 2011 Science and Technology conference. In his interview, he highlights the importance of CTBTO monitoring data being made available for research purposes and the anticipated impact of digital technology on improving the location of seismic events. More on the 2011 Science & Technology conference: http://www.ctbto.org/specials/ctbt-science-and-technology-20118-10-june-2011-...