John Jantsch is a marketing consultant, speaker, and the acclaimed author of , The Referral Engine, and The Commitment Engine. He is the founder of the Duct Tape Marketing Consultant Network. His popular blog and podcast Duct Tape Marketing was chosen as a Forbes favorite, a top ten marketing show on iTunes, and called a "must listen" by Fast Company. Huffington Post calls him one of the top 100 "Must Follow" on Twitter and Forbes named Duct Tape Marketing one of the 100 Best Websites for Entrepreneurs. He writes regularly for American Express OPENForum and speaks at American Express, Intuit, Verizon, HP, Citrix, and other organizations. His practical take on small business is often cited as a resource in publications such as the Wall Street Journal, New York Times, and CNNMoney and he has appeared on MSNBC.