Mindful Schools is aware of these criticisms, and is beefing up its research efforts. In 2012, the group worked with a University of California at Davis research team to conduct a randomized controlled study of three elementary schools in Oakland, California. They sent in outside mindfulness instructors for 15 minutes, three times a week, to teach some classrooms but not others, and reported that mindfulness improved students’ behavior and ability to focus, as well as teachers’ sense of well-being—though the research design had several main points of weakness, mostly involving the challenge of measuring children directly rather than through teacher assessments. Mindful Schools’ new research director told me that the group is eager to conduct more studies that are even better-planned, focusing more on the efficacy of the kind of integrated training Gonzalez received. The field is so new that techniques evolve rapidly, constantly going through phases of trial-and-error—so it remains to be seen whether current or future findings can convince skeptics of mindfulness’s effectiveness.

* * *

Back in the Bronx, after a minute or two of the day’s mindfulness exercise, his own eyes also closed, Gonzalez ran through a list of emotions: Happy. Sad. Excited. Mad. Bored. Loving. Worried. Jealous. Silly. The second item on this list seemed to especially resonate with an 18-year-old at the front of the classroom, a young woman with dark skin, shimmering pink lip gloss, and perfectly plucked eyebrows. Sitting up straight with her hands in her lap, her composed posture belied the challenges she faced shortly before transferring to Arturo A. Schomburg two years earlier.

“I didn’t know anybody. I was very depressed. I didn’t want to be in school,” she told me in a hushed voice at the end of class. Shortly before transferring to this school, her favorite big brother had been hit by a car. She said she’d watched him fall into a coma, and sat by his side until his heart stopped; soon after that, she’d seen one of her friends get shot in the head and bleed to death in the street. During the quiet minutes set aside for mindfulness exercises in class, she would often cry.

Now, she writes in perfect, neat script as she fills out a worksheet to accompany the day’s mindfulness exercise. But she told me she wasn’t always so eager to participate. “I used to write, ‘I hate this, I don’t want to do this.’ I ripped those papers up,” she said. But one day when she was in a particularly dark mood, something clicked. “Argos told me to close my eyes. Then he said, ‘Connect to your breath.’ He always used to say it, but I never really did it until then.” Gonzalez told me that his Mindful Schools training had specific segments dedicated to working with trauma.

“I noticed that I could feel [my breath] in my chest,” she told me, “And at that moment, I felt so relieved. The only thing I could think in my mind was, ‘I’m ok.’ And, I don’t know—from that day on, it just didn’t hurt anymore.” She told me she hadn’t been in fights the way she once used to. Her four other brothers are in jail, and she is convinced it’s because they didn’t get the mindfulness training she now has. “Your emotions drive you mad,” she said, but escaping them is possible by “focusing on now.” (Our conversation also benefitted from the fact that I myself have some knowledge of mindfulness; I discovered it during a year off from college as I struggled with anxiety and depression.)