John Jantsch is a marketing consultant, speaker and author of Duct Tape Marketing, Duct Tape Selling, The Commitment Engine and The Referral Engine and the founder of the Duct Tape Marketing Consultant Network.
John Jantsch is a marketing consultant, speaker and author of Duct Tape Marketing, Duct Tape Selling, The Commitment Engine and The Referral Engine and the founder of the Duct Tape Marketing Consultant Network.