Elizabeth "Lisa" Stillman Bartlett is the sarcastic owner of Fairfield Stables. Her current horse is named Cinders. Jack and Lisa begin a romantic relationship, but they are troubled by her constant travelling for work.

In season 6, Jack and Lisa "called the quits" and were apart for sometime. After Lisa's return in season 7, they reconciled then eloped in the season 7 finale with Tim Fleming as Jack's best man. Lisa is also the godmother to Lou & Peter's daughter, Katie. She's the co-owner for the Dude Ranch with Lou Fleming.