American Masters is a PBS television show that features biographies on artists, actors and writers from the US who have had an impact on pop culture. Produced by WNET in New York City, the show debuted on PBS in 1986. In 2003 they produced their best episode when they decided to tackle TV legend Rod Serling. Here is that episode in its entirety.
I am still waiting for them do an episode of Gene Roddenberry which looooong overdue.