For many, cancer care is not just a career, but a calling. In honor of International Day of Medical Physics and Radiology Day, Limin Song, Ph.D., medical physicist, and Anthony Salazar, R.T., (R)(T), chief radiation therapist at Texas Center for Proton Therapy, both share what inspired them to specialize in proton therapy and a glimpse into their day-to-day life caring for cancer patients.