Keller and his writing team have written several nationally best-selling books: The Millionaire Real Estate Agent, The Millionaire Real Estate Investor, SHIFT: How Top Real Estate Agents Tackle Tough Times, FLIP: How to Find, Fix, and Sell Houses for Profit, HOLD: How to Find, Buy, and Rent Houses for Wealth, and The ONE Thing: The Surprisingly Simple Truth Behind Extraordinary Results. In 2012, Keller and his team launched KellerINK, setting out to create books that challenge and inspire readers, while giving them the practical tools and instruction needed to turn inspiration into action.