For the last 25 years, Sunday nights at 8pm on C-SPAN has been appointment television for many Americans. During that time, host Brian Lamb has invited people to his Capitol Hill studio for hour-long conversations about contemporary society and history. In today's soundbite culture that hour remains one of television's last vestiges of in-depth, civil conversation.

First came C-SPAN's Booknotes in 1989, which by the time it ended in December 2004, was the longest-running author-interview program in American broadcast history. Many of the most notable nonfiction authors of its era...