Frederick F. Reichheld (born 1952, Cleveland) is a United States business author and business strategist best known for his research and writing on the loyalty business model and loyalty marketing. His books include The Loyalty Effect (1996), Loyalty Rules! (2001), and The Ultimate Question: Driving Good Profits and True Growth (2006). He has also authored articles for business publications such as Harvard Business Review. He speaks on loyalty and other business topics at management conferences and similar events.Reichheld is a Fellow of the management consultancy Bain & Company, where he has worked since 1977. In 2003, Consulting Magazine named him one of the world's top 25 consultants.