Audio In this episode of the Pen and Sword podcast, Emily Donahue speaks with Brian Andrews and Jeffrey Wilson, the authors behind the phenomenally successful Tier One thriller series featuring Navy SEAL John Dempsey. In a wide-ranging conversation, the authors discuss their writing process, how they incorporate global geopolitics into their storylines, and what comes next for both themselves and their protagonist. The Tier One series is a No. 1 Amazon Best Seller series with six volumes. Collateral is the sixth . Subscribe to the Stratfor Podcast wherever you listen, including: Apple Podcasts Google Podcasts Podcast Addict Castbox Stitcher Spotify Suggested Reading: Collateral (Tier One Thrillers Book 6) , by Brian Andrews and Jeffrey Wilson. Tier One Series , by Brian Andrews and Jeffrey Wilson. From Stratfor Worldview: Essential Geopolitics: Alexei Navalny, Russia and the EU The U.S.'s Eurasia Obsession, Part 1: Setting the Stage , by Rodger Baker.