Greg founded Stand to Reason in 1993 and currently serves as President of Stand to Reason. He has spoken on more than 70 college and university campuses both in the U.S. and abroad and has hosted his own call-in radio show for 27 years, advocating for “Christianity worth thinking about.” He has debated atheist Michael Shermer on national radio and Deepak Chopra on national television. An award-winning writer and best-selling author, Greg has written seven books, including The Story of Reality—How the World Began, How It Ends, and Everything Important that Happens in Between; Tactics—A Game Plan for Discussing Your Christian Convictions, and Relativism: Feet Firmly Planted in Mid-Air. Greg has been featured on Focus on the Family radio and has been interviewed for CBN and the BBC. He's been quoted in Christianity Today, the U.S. News & World Report, and the L.A. Times.

Greg received his Masters in Philosophy of Religion and Ethics at Talbot School of Theology, graduating with high honors, and his Masters in Christian Apologetics with honors from Simon Greenleaf University. He is an adjunct professor in Christian apologetics at Biola University.