John Jantsch is a marketing consultant, speaker and best selling author of numerous books, including Duct Tape Marketing, Duct Tape Selling, The Commitment Engine The Referral Engine, and SEO for Growth. He is the creator of the Duct Tape Marketing System and Duct Tape Marketing Consulting Network that trains and licenses small business marketing consultants around the world.​  He also hosts The Duct Tape Marketing Podcast.