Mark Sherrett, 25, loves horseback riding. He rides every Sunday, weather permitting, at the Piscataway Riding Stable in Clinton, MD.

Mark has autism. He is largely non-verbal; although he understands language, he rarely speaks more than a few words at a time.

Here, Mark waits for a horse at Piscataway, as his younger brother Daniel and mother Marie converse. It was his mother's first time riding, and Mark surrendered his long-time horse to her, so that she would be sure to have a good one.