He was born in Beavercreek, Ohio to the late Rowena and William Gentner Sr. He was preceded in death by his brothers, Harold Gentner, Raymond Gentner, and William Gentner Jr., and his sister, Juanita Gentner.
He is survived by his children, Kevin (Sherry), Ronald, April Bieker (Brian), and Karen Gentner.
He also leaves behind his beloved grandchildren, Kyle Gentner, Kayla Meyers, Nicole Gentner, Heather Gentner, Ryan Gentner, David Bieker, Jason Bieker, Tyler Bieker, Anthony Bieker, Lindsay Bieker, Alexander Bieker, Brittany Gentner, Kaylee Gentner, Skyler Gentner, Taylor Gentner, and Spencer Gentner. His great-grandchildren include Wesley and Raelynn.
He is also survived by his sisters, Alice McCoy (Jack) and Linda Pritchard.
James was proud of his job at Eastgate Ford. He loved sports especially the Cincinnati Reds, Cincinnati Bengals, Ohio State Buckeyes, and Nascar.
A private memorial service will be held at the convenience of the family.