Favorite video: How 3 Denver businesses keep clients Posted byAaron Hoos April 21, 2010June 8, 2012 Leave a comment on Favorite video: How 3 Denver businesses keep clients Learn the secrets of customer retention from these 3 Denver-based businesses. Published by Aaron Hoos Aaron Hoos is a writer, strategist, and investor who builds and optimizes profitable sales funnels. He is the author of The Sales Funnel Bible and other books. View more posts