Watch Free Online on Hurawatch. Clessie Cummins: Hoosier Inventor details the life of a Hoosier farm boy with a knack for innovation. The father of the American diesel truck engine, Cummins combined elbow grease, a keen mind, and rural pragmatism to co-found what became Cummins, Inc., a Fortune 500 international diesel and alternative fuel engines company headquartered in Columbus, Indiana.