Recommended podcasts by experts in their fields?

I have been listening to the PreHistory Podcast, written and produced by an actual academic archaeologist. I enjoy the rigor and specificity but i’m having trouble finding similar content I like, especially without the promotions and ads and fan service. I know that in the age of social media personalities such dry content is hard to come by.

I particularly enjoy ancient history, but feel free to offer other podcasts that feature people who have mastered their discipline and have found clear, effective, and even entertaining ways of sharing it. Thanks!