Gary Stevenson is the author of "The Trading Game." He spent his early 20s trading trillions of dollars for Citibank in London and Tokyo. He talks to Business Insider about office culture in Canary Wharf, London, the mindset of profitable bankers, their daily routine, the bonuses, and what leaving the job is like. Now, Stevenson is a published author and teaches economics through his YouTube channel, Garyseconomics.br br Shawn Ryan served as a Navy SEAL for almost six years. He discusses his time in Basic Underwater DemolitionSEAL training, or BUDS, and how he was recruited. After seeing combat in Afghanistan, Iraq, and Haiti, Ryan left the Navy and worked as a contractor for the CIA. Today, he runs a YouTube channel and a podcast, "The Shawn Ryan Show."br br Andrew Bustamante spent seven years working covertly as an officer in the Central Intelligence Agency. The CIA recruited him while he was applying to join the Peace Corps after leaving the Air Force. He discusses work as a spy and CIA protocol. Bustamante now runs his own training company, Everyday Spy.br br Maven Huffman, a former WWE wrestler, discusses his five-year career in professional wrestling. Huffman shares his experience using steroids, his personal struggles with addiction, and the intense physical toll of wrestling. He talks about Vince McMahon and the unforgettable moment he eliminated The Undertaker from the Royal Rumble.br br Kenneth Valentine served as a special agent in the US Secret Service for 24 years and protected three sitting presidents, Bill Clinton, George W. Bush, and Barack Obama. Valentine gives insight into what failures played out during the assassination attempts on former President Donald Trump. He also covers surveillance tactics, training, weapons, and US election protocols. Today, he's a published author, leadership expert, and public speaker.br br Editor's note: This video misstates referee Mike Chioda's years active with WWE. He retired in 2022, not 2002.br br BI was unable to substantiate Gary Stevenson's claims of being Citibank's most profitable trader.