I was seventeen and on the verge of quitting school altogether the week Mr. Reyes substituted for our math teacher, though nobody in that classroom knew it, least of all him. I had stopped raising my hand months earlier, stopped doing homework, stopped caring whether the numbers on the board made sense.
He noticed within the first ten minutes, the way certain teachers just do. When he called on me and I muttered that I didn't get it and never would, he didn't move on the way most substitutes did. He walked over, pulled up a chair beside my desk, and worked through the problem with me, slowly, out loud, until something clicked that had refused to click for months.
Before long, he was doing the same for two other students who had drifted to the back of the room the way I had. He never once made it feel like charity. He just kept saying the same thing, quietly, every time someone got something wrong: "Good, now we know what it isn't. Try again." Class ended, he packed up his single bag of chalk and worksheets, and I never saw him again — our regular teacher came back the next day, and Mr. Reyes moved on to whichever school needed him next.
I finished that semester. Then the next one, and eventually a degree in engineering I am fairly sure I would never have finished if not for that one afternoon. If only I had asked his first name that day, finding him again wouldn't have taken decades. Had I known, at seventeen, that I would spend years wondering about a substitute teacher's full story, I might have asked more questions while I had the chance.
I finally found him again at a district retirement ceremony decades later, honoring substitute teachers who had served for twenty-five years or more. Talking with him afterward, I learned he had nearly dropped out himself at sixteen, saved by a teacher who did exactly what he later made a habit of doing for strangers' classrooms for the rest of his career. He didn't remember me specifically, not out of thousands of students over the years, but he smiled anyway when I told him the story, and said it was, in his words, exactly why he kept showing up.