[1] He studied at the Vrije Universiteit Amsterdam, and was ordained as a minister in the Reformed Churches in 1904.
[3] Hepp gave the Stone lectures at Princeton in 1930, published under the title Calvinism and the Philosophy of Nature.
In it he expressed an agreement with the theology of the First Vatican Council, "that God could be known from the world of created reality through the natural light of reason.
[8] Hepp was the inaugural editor-in chief of De Reformatie magazine, established in 1920.
[11] Hepp's copy of the Corpus Reformatorum edition of John Calvin is now in the library of Westminster Theological Seminary.