| Margaret Race |
Scientist and planetary protector, SETI |
ideaCity 2010 |
| Phil Radford |
Executive director, Greenpeace USA |
TEDxOilSpill |
| Bernd Radig |
Professor of Informatics, Technical University Munich |
DLD 2006 |
| Jeneanne Rae |
Co-founder and President, Peer Insight |
BIF-2 |
| Michael Rae |
Researcher |
ideaCity 2008 |
| Michelle Rainey |
Medicinal cannabis advocate |
ideaCity 2009 |
| David Rakoff |
Humorist |
ideaCity 2002 |
| John Ralston Saul |
Political essayist |
ideaCity 2009, ideaCity 2000 |
| V.S. Ramachandran |
Neuroscientist |
TEDIndia |
| Vilayanur Ramachandran |
Director, Center for Brain and Cognition at UC San Diego |
TED2007 |
| Kavita Ramdas |
Director, Global Fund for Women |
TEDIndia |
| Abner Ramirez |
Musician, Johnnyswim |
Gel 2011 |
| Joshua Cooper Ramo |
Managing director, Kissinger Associates |
DLD 2010 |
| Pukul Rana |
Interactive Media Consultant, British Council |
Lift07 |
| Lisa Randall |
Physicist |
DLD 2008, ideaCity 2007, TED2006 |
| James Randi |
Conjurer |
TED2007 |
| Rajesh Rao |
Computational neuroscientist |
TED2011 |
| Ramana Rao |
Entrepreneur |
TED8 |
| Alain T. Rappaport |
General manager of health search , Bing, Microsoft |
DLD 2010 |
| Bernard Rappaz |
Hemp activist |
Lift06 |