The equation on the whiteboard wasn’t hard. Two-step, nothing exotic. But the boy in the third row had already put his pencil down and folded his arms, and Mark Anthony O. Calderon knew that posture before he knew the kid’s name. It’s the posture of a student who has decided the answer is no before the question is finished.
Getting that pencil back up is the actual job. Not the math — the surrender that comes before it. Now a middle school mathematics teacher at Barstow STEM Academy in California, part of the Barstow Unified School District, Mark has spent five years in American classrooms teaching a subject most of his students walk in already afraid of.
Teaching the students, not just the subject
His days run on the ordinary machinery of the job: planning lessons, grading, keeping thirty preteens focused, talking with parents, adjusting for kids who each need something different. He describes all of it, though, as a means to one end.
“Beyond teaching mathematics, I strive to inspire my students to believe in their own potential and to develop a lifelong love for learning,” he shares with TGFM. Coming from some teachers that would be filler. From him it lands closer to a description of what he actually does all day, because he keeps pulling the conversation back to specifics — the kid who was failing, the concept that wouldn’t stick, the face when it finally does.
He taught this way in the Philippines too, before any of the overseas chapters. Back home he ran academic competitions, mentored, joined community outreach. “I have always believed that a teacher’s role extends beyond the classroom,” he explains, “by helping students build character, confidence, and resilience.” California didn’t rewrite that belief. It stress-tested it against a new system and a room full of students whose lives looked nothing like the one he grew up in.
The years no one sees on a résumé
On paper the story is clean: five years abroad, a steady post, a recent award. The paper leaves out the first two years, which nearly broke him.
“There were moments of homesickness, self-doubt, and uncertainty, especially during my first years abroad,” the Filipino educator recalls. Learning a new culture and a new school system while half a world from his family took a kind of stamina no teaching license covers.
What got him through wasn’t a technique. It was a phone line home. “My family has always been my greatest source of strength and inspiration,” he says. “Their encouragement motivated me to keep moving forward despite the difficulties.” He built a second circle too — other Filipinos, trusted colleagues — people who made a strange place feel survivable. The homesickness never fully left. It just stopped winning.
Money was part of why he came; he doesn’t pretend otherwise. Like a lot of overseas Filipino workers, he left to give his family a better shot. But he was also after the harder-to-measure things: sharper teaching, a different system to learn from, the chance to get better at the one thing he already knew he was good at.
When the effort finally has a name
For the 2025–2026 school year, his school named him Teacher of the Year. Recognition like that tends to arrive late, long after the person has already decided to keep going without it.
He brings it up, but not as the headline. The payoff he actually chases is smaller and happens on repeat. “The most rewarding part of my work is witnessing students who once struggled become confident learners,” the former Philippine classroom teacher says. “Seeing their excitement when they understand a difficult concept or achieve a personal milestone makes every challenge worthwhile.” The award, and getting to represent Filipino teachers abroad by earning it, ranks among his proudest moments. But it’s that daily click of understanding he keeps describing when you ask what the job gives back.
A man crossed an ocean to teach numbers and spends almost every answer talking about people — confidence, character, the fear a kid carries into fourth period and sometimes leaves on the desk when the bell rings.
Looking toward home
Even settled in California, he keeps looking west across the Pacific. When the overseas years wrap, he wants to carry what he’s learned back to Philippine classrooms. “I would like to continue mentoring young teachers, support educational programs, and advocate for quality mathematics education,” he says, next to the plainer wish to be near his family again.
His advice to fellow OFWs sounds like someone who has already field-tested it. Hold onto your purpose, he says, and your values. “Manage your finances wisely, prioritize your physical and mental well-being, and surround yourself with people who genuinely support your growth,” he adds. “Every challenge is an opportunity to become stronger.”
He isn’t reciting a motto. He’s describing the actual route — a classroom in the Philippines, a middle school in the Mojave Desert, and, someday, the trip back.
