He earned his Doctor of Philosophy degree in Church History from Harvard University in 1945.

Gerstner counted among his students noted author and preacher R. C. Sproul, founder of Ligonier Ministries;[1] Dr. Arthur Lindsley, Senior Fellow at the C.S.

Robert Ingram, founding board member and Headmaster of The Geneva School; and Dr. Mark Ross, the John R. de Witt Professor of Systematic Theology and Director of the Institute for Reformed Worship at Erskine Theological Seminary.

In addition to his books, Gerstner recorded several lengthy audio courses giving a survey of theology, church history, and Christian apologetics, which are distributed through Ligonier Ministries.

Soli Deo Gloria: Essays in Reformed Theology included contributions by Cornelius Van Til, J. I. Packer, Philip Edgecumbe Hughes, John Murray, R. C. Sproul, John Warwick Montgomery, and Roger Nicole.