John reads and answers his own email. The quickest route is cressler@ece.gatech.edu — or use one of the starting points below, which will fill in a subject line for you.
Book groups & reading circles
John is glad to join reading groups using any of his books — in person where practical, otherwise by video call or phone. Discussion questions are included in the back matter of the novels, and Gateway to the Divine closes each chapter with reflection questions.
Invite John to your book groupSpeaking & events
Festivals, bookstores, universities, congregations, retreat centres and conferences. Topics range across medieval Muslim Spain and convivencia, the microelectronics revolution, and the dialogue between science and spirituality.
Enquire about a speaking dateMedia & review copies
Interview requests, review copies and press materials. For Gateway to the Divine (December 2026), review copies are handled by Orbis Books; write to John directly and he will put you in touch.
Make a media enquiryHear about new books first
Gateway to the Divine: Finding Spirituality in Science is published by Orbis Books in December 2026. Join the mailing list and you will hear when it ships, and when John is speaking near you.