Dr. Jamie D. Aten, disaster psychologist and founder and executive director of the Humanitarian Disaster Institute (HDI) at Wheaton College, intertwines his journey of battling cancer with lessons learned from being in the throes of disaster zones around the globe in his new book, “A Walking Disaster: What Hurricane Katrina and Cancer Taught me About Faith and Resilience,” releasing Jan. 14, 2019 from Templeton Press.