John Jantsch, creator of the Duct Tape Marketing System is a marketing consultant, speaker and best-selling author of Duct Tape Marketing, Duct Tape Selling, The Commitment Engine, The Referral Engine, and SEO for Growth.
John Jantsch, creator of the Duct Tape Marketing System is a marketing consultant, speaker and best-selling author of Duct Tape Marketing, Duct Tape Selling, The Commitment Engine, The Referral Engine, and SEO for Growth.