Fonds consists of records created or accumulated by John Kentfield in the course of his career. The majority of the records are research projects and publications (correspondence, background research, articles, reviews, typescript and handwritten notes, calculations, test results, conference presentations, research grants and patents). The fonds also includes teaching materials (course notes, readings and handouts, diagrams and calculations, assignments and exams.

Kentfield's areas of research included: wind turbines and wind energy, combustion engines, aircraft with outboard horizontal stabilizers (OHS), thermal dynamics, Stirling engines, and pulsed combusters.