A young man with intellectual disabilities (ID) and mental illness, who had previously been taught to successfully manage his aggressive behavior by using "Meditation on the Soles of the Feet," reported that he shared his mindfulness practice with his peers with ID. When requested by his peers, and without any training as a therapist, he began to teach this procedure to his peers for controlling their anger and aggressive behavior. We tracked the anger and aggressive behavior of three of the individuals he taught and the fidelity of his teaching of the procedure. According to self and staff reports, anger and aggressive behavior of the three individuals decreased to very low levels within five months of initiating training and remained at very low levels for the two years during which informal data were collected. The fidelity of his teaching the procedure was high, if one allows for his idiosyncratic teaching methods. These findings suggest that individuals with mild ID, who have mastered an effective mindfulness-based strategy to control their aggressive behavior, may be able to teach their peers the same strategy to successfully control their anger and aggressive behavior to a level that is acceptable for community living. (Contains 1 figure and 1 table.)