Collier completed his undergraduate studies at the University of Western Ontario with a Bachelor of Medical Sciences (Honours Specialization in Physiology) and interviewed at four Ontario medical schools and five American medical schools ranked in the top 40. Collier completed his medical school training at the University of Toronto, where he worked as a file reviewer for medical school applicants. He developed a passion for healthcare advocacy and working with marginalized populations while in medical school, and he is currently training at the University of Calgary for his ophthalmology residency.