Dr. Stewart was born in West Virginia and he graduated from medical school at the University of West Virginia, where he became a Christian from the Intervarsity bible study led by his chemistry professor. He married his bride Ruth while in medical school and he spent 3 months of externship at Hospital Bautista in Asuncion, Paraguay. He completed a medical residency at Duke University in North Carolina. He is certified in geriatric, travel medicine and clinical densitometrist diagnosing and treating osteoporotic patients. Also, he currently serves as the director of the student health services at Southeastern Baptist Theological Seminary. He has a heart for missions and he and Ruth have been involved in several medical mission trips throughout the years.

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In 2009 he became the founding president of IICD-Good Shepherd Ministries and the US medical director of the Good Shepherd Medical clinic in Xela, Guatemala. He is currently working on a project to raise funds for the ministries through importing coffee beans from Guatemala and partnering with a local roaster in Raleigh, NC to market the coffee to churches and coffee shops.