Jim Bidzos, creator of the RSA Conference, credited a phone call that he had with Marc Rotenberg in 1991 as the inspiration for the first RSA Conference. Rotenberg was the Washington Director at the Computer Professionals for Social Responsibility, or CPSR, from 1988 to 1994. The RSA Conference grew from a small gathering of around 60 people, mostly cryptographers, to the world's largest security conference with tens of thousands of attendees each year.