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