Podcast advertising is on its way to a projected $500 million annual spend for the year 2020. The medium is growing fast, but there's a lot of mystery and confusion surrounding its best practices. Glenn Rubenstein is the author of the book Podcast Advertising Works: How to Turn Engaged Audiences Into Loyal Customers. He's also the founder of the ADOPTER Media podcast advertising agency. Whether you're a podcaster or a potential advertiser, this series will answer your questions and provide insight on proven methods for successful sponsorships.