Joohun is a graduate of The Johns Hopkins School of Medicine, a 99th percentile MCAT scorer, and a former MCAT instructor at The Princeton Review. He has taught MCAT students privately across the country for the past five years, helping students improve by an average of 11 points.

His teaching philosophy is built around one principle: depth over breadth. Rather than racing through topics, he works with students on a subject until they consistently score 15% above the average of UWorld.

Joohun is also a screenwriter. His first feature film was selected for the Sundance Lab and later produced by Oscar winner Forest Whitaker. He and a small team of professional writers work with a limited number of students each year on their medical school applications.