Benjamin "Ben" Stillman is a character of season one.
He gets to Heartland when his aunt, Lisa Stillman needs somewhere for him to learn more about other sides to do horse training and their care. While he is at first skeptical, if not straight up rude about Amy's methods, he learns through their use on his own horse Red that they can be practical and useful even to serious show competitors like himself.
Later he goes to work for Nick Harwell.