In 2003, with the release of The Millionaire Real Estate Agent, co-authored by Gary Keller and Jay Papasan, Jenks became a best-selling author when the book spent time on BusinessWeek's best-seller list. In 2005, they co-authored their second book, The Millionaire Real Estate Investor, which reached The New York Times best-seller list , as well as BusinessWeek's best-seller list.

Prior to joining the company in 1996, Jenks was president and CEO of Century 21 South Central States, based in Dallas, Texas. Jenks has been in the real estate industry since 1981, has taught for the Dale Carnegie Institute, and owned his own training company, The Leadership Connection Inc.