Dr. Geoff Tabin is a medical visionary, humanitarian, accomplished mountain climber, professor of ophthalmology and global medicine at Stanford University, and co-founder of the Himalayan Cataract Project, a nonprofit organization working to eradicate preventable blindness in the developing world.

As a professional speaker, Colonel Mullane has thrilled tens of thousands of adults and a half-million children with his inspirational, motivational and humorous descriptions of the astronaut experience.