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Charlie Sheen is an American actor and author known for Platoon, Wall Street, Major League and the television comedy Two and a Half Men. He won a Golden Globe for Spin City and later published The Book of Sheen, with subsequent work in documentary, podcasting and television production.
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Daniel Lubetzky is a Mexican-born American entrepreneur, investor and author who founded KIND Snacks. His business and civic projects include PeaceWorks, OneVoice, Camino Partners and Builders. He wrote Do the KIND Thing and is a regular investor on Shark Tank.
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Chris Watters, also known as Christopher Watters, is a real estate broker, entrepreneur and author who founded Watters International Realty. His residential brokerage uses specialized team roles. He co-authored The Million Dollar Real Estate Team with Bradley Pounds and works in real estate training and technology.
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Mark Cuban is an American entrepreneur and investor whose early work in computer systems and internet audio and video expanded into sports, film, venture investment and pharmaceuticals. He was the Dallas Mavericks’ controlling owner and a longstanding investor on Shark Tank, and co-founded Mark Cuban Cost Plus Drug Company.
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Vick Tipnes is a London-born, U.S.-based entrepreneur, author and speaker who founded home sleep-testing company Blackstone Medical Services. He wrote the personal-development book Did You Sell Your Soul? and launched the Rise Conference for business owners and entrepreneurs.
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Tony Buzbee, formally Anthony Glenn Buzbee, is an American lawyer, entrepreneur, author and podcast host who founded The Buzbee Law Firm. A former Marine officer and Texas A&M University System regent, he handles commercial, injury and high-profile litigation and has run for Houston mayor and city council.
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Richard Harpin is a British entrepreneur, investor and author, founder of HomeServe, founder and chairman of Growth Partner, and owner of Business Leader. He developed a home-repair-cover business into an international company and increasingly focused on investment and business mentoring after Brookfield acquired HomeServe. He wrote How to Make a Billion in Nine Steps and was named in the 2026 New Year Honours.
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Omar Soliman is a co-founder of College HUNKS Hauling Junk & Moving and Trash Butler, an author, film producer and speaker. With Nick Friedman, he developed a junk-removal business into a franchise network, coauthored Effortless Entrepreneur and appeared on Shark Tank, Undercover Boss and School of Hard Knocks.
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Nico Lagan is a podcast host, political commentator, author and coach who previously worked in telecommunications sales engineering. He hosts The Nico Lagan Show and The Political Orphans, wrote Purpose, has appeared on School of Hard Knocks and offers podcast content and production consulting.
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Khalil Rafati is an American entrepreneur, author and speaker, and a co-founder of SunLife Organics. He founded the transitional living facility Riviera Recovery and wrote I Forgot to Die and Remembering to Live about recovery and rebuilding his life. He has spoken at TEDxWakeForestU and been interviewed by School of Hard Knocks.
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Kevin Hart is an American comedian, actor, producer and entrepreneur known for stand-up comedy and films including Ride Along and Jumanji. He serves as chairman and CEO of Hartbeat, has published a memoir and children’s fiction, and has developed several business ventures. He received the Mark Twain Prize for American Humor in 2024 and has been interviewed by School of Hard Knocks.
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Kendra Scott is an American jewelry designer, entrepreneur and author who founded her namesake brand in 2002 and serves as executive chair and chief visionary officer. She established a foundation supporting women and young people, supports women’s entrepreneurial education, and appears on ABC’s Shark Tank. She has been interviewed by School of Hard Knocks.
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Ken McElroy is an American real-estate investor, entrepreneur and author who co-founded MC Companies and is a principal of The Founders Group. His work spans multifamily investment, property management and real-estate education through books, podcasts and videos. He has been interviewed by School of Hard Knocks.
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Kayla Itsines is an Australian fitness trainer, entrepreneur and author who co-founded the women’s fitness platform Sweat. Known for Bikini Body Guide and her online fitness community, she has been interviewed by School of Hard Knocks.
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Karlton Dennis is an American tax strategist, entrepreneur and content creator who founded and leads Tax Alchemy. He hosts Tax Free Living and Wealth Made Simple and has been interviewed by School of Hard Knocks.
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Joshua Crisp is an e-commerce entrepreneur, trainer and author involved in Amazon brands and seller education. He founded AMZ Formula, wrote One Product Away and has been interviewed by School of Hard Knocks.
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Doug Williams is a healthcare executive, investor, management adviser and author. A former executive vice president and chief operating officer of HMS Holdings, he is cofounder and board chair of Empactful Advisors and a general partner at Empactful Capital. He wrote Shift: A Playbook for Positive Change and has appeared on School of Hard Knocks.
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Chris Meroff is an entrepreneur, author and leadership consultant who ran MSB Consulting, serving school districts, before pursuing investment, community and farm ventures. He wrote Align and The Empathy Revolution and has appeared on School of Hard Knocks.
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Biological War: A Scenario is a nonfiction book by American author and investigative journalist Annie Jacobsen, published in the United States by Dutton, an imprint of Penguin Random House. The book imagines a biological war scenario and traces the societal collapse that could follow in the hours, days, and weeks after the event; it is the author’s next “scenario” book after Nuclear War: A Scenario.