Rence Ricohermoso is a seasoned international educator and Middle School Mathematics Teacher at Singapore American School with 21 years of experience across the Philippines, Thailand, the United States, China, South Korea, and Singapore. He holds a Master of Education in Educational Leadership and is currently pursuing a Doctor of Education in Leadership at the American College of Education. Rence specializes in project-based learning (PBL), service learning, and equity-focused math education, integrating the UN Sustainable Development Goals (SDGs) to promote global citizenship and sustainability. His research explores how culturally responsive leadership and sustainability education support Third Culture Kids (TCKs) and empower learners through meaningful, real-world learning experiences. Rence regularly presents at international conferences, sharing practical strategies that inspire educators to connect mathematics with purpose and global impact.