Michael McCullough is an American investor in healthcare and life science companies, social entrepreneur, and emergency room doctor.

[6][7] To better control his stuttering, McCullough used different accents for public speaking, teaching, and stand-up comedy, which he also used to support his way through college and medical school.

[19][20] McCullough works as a consultant to venture capital funds on life science, impact, and education focused investments at Redpoint, NanoDimension, and Venrock.

[33] McCullough is a co-founder and the president of QuestBridge,[34][35] a non-profit NGO that places talented low-income students into US colleges with financial aid.

[50] McCullough was elected an Ashoka Fellow in 2004[14] and was named a top American social entrepreneur in 2006 for-profit entrepreneurship and investing.

[51] McCullough is a part-time assistant clinical professor of emergency medicine at the University of California, San Francisco (UCSF) campus in Fresno.