Heather Douglas, former exec at HD Entertainment, has joined Dennis Miller’s syndicated radio show as a producer.Douglas will focus on booking celeb guests for the Westwood One-distribbed yakker. Since the bow of “The Dennis Miller Show” last year, its affiliate base has grown to more than 200 stations, including outlets in the top 15 markets. Miller’s three-hour daily gabfest is a blend of topical comedy, questions from listeners and celeb and newsmaker interviews. Douglas’ background includes working as a talent wrangler for the Golden Globes, American Music Awards and the U.S. Comedy Arts Festival.