John Jantsch – Marketing Consultant, Speaker, and Author John Jantsch is a marketing consultant, speaker, and author of Duct Tape Marketing, The Referral Engine, Duct Tape Selling, The Commitment Engine, and SEO for Growth. His newest work, The Self-Reliant Entrepreneur: 366 Daily Meditations to Feed Your Soul and Grow Your Business taps into the wisdom of 19th-century transcendentalist literature and the