It was a warm Monday evening. Birds were swooping and chirping outside my windowsill. The net of the basketball hoop was swaying in the breeze. I was thinking of all the videogames I could be playing....

On a recent October morning, Duncan Magidson (’12) stood up in the St. Agnes gym and smoothly presided over Urban’s all-school meeting as student body co-president. It was a long way from where...