The link below will take you to a fine documentary about the pulp magazines that were so popular from the 1920's to the 1950's. It is called PULP FICTION: THE GOLDEN AGE OF SCI-FI, FANTASY AND ADVENTURE. Ray Bradbury, of course, began his writing career in the pulps, starting with SUPER SCIENCE STORIES, and later becoming one of finest writers for WEIRD TALES, among many other magazines. Ray is interviewed at several points during the documentary, as is science-fiction writer Frederik Pohl. Before he began his own writing career, Mr. Pohl was a pulp magazine editor and literary agent. And at one point in the film, at around the 14:50 mark, Ray notes that as a young writer seeking an agent, he sent his stories off to a young literary agent named Fred Pohl, who rejected his stories and refused to represent him. To which Fred Pohl replies, "I try to forget about that!" Enjoy!

https://www.youtube.com/watch?v=HzlbRjmWEQ8&t=916s

As noted in the above post, interviews with both Ray Bradbury and Frederik Pohl were included in the show PULP FICTION: THE GOLDEN AGE OF SCI-FI, FANTASY AND ADVENTURE, which can be accessed by the link in that post. Mike Glyer's fine website, FILE 770, had a post of its own about Ray and Mr. Pohl after the latter's death in 2013, called "The Last Meeting of Two Literary Lions", which can be accessed via the link below:

https://file770.com/last-meeti...-two-literary-lions/

And in a 2008 interview with Liz Armstrong that appeared on the vice.com website, in response to a question as to whether he ever crossed paths with Ray Bradbury, Mr. Pohl replied: "Very little of Bradbury’s life involved any of mine. We did meet now and then but not very often. We ran into each other a couple of times at the Worldcon. Whenever I went out to Los Angeles we’d have lunch together. But he moved up the food chain and traded in his roller skates for a chauffeur."