Born in Harrisburg, John Donald Bitner, Sr. known as "Mr. Mt. Gretna" graduated from the John Harris High School in 1935. Served in the U.S. Army Air Corp until 1938 at which time he enrolled in ae...view moreBorn in Harrisburg, John Donald Bitner, Sr. known as "Mr. Mt. Gretna" graduated from the John Harris High School in 1935. Served in the U.S. Army Air Corp until 1938 at which time he enrolled in aeronautical engineering at the University of Pittsburgh. In his senior year he met his future wife, Jeanine Stephenson. Upon graduation Jack was commissioned into the U.S. Army Air Force where he served during WWII. After the war, Jack and Jeanine were married and Jack became employed with Martin Aircraft Co in Baltimore, MD. At Martin Jack designed several missiles one of which was deployed in Germany and Okinawa as an atomic deterrent. upon retirement, he and Jeanine bough a home in Mt. Gretna where his family always had a cottage going back to his grandparents at the first campmeeting in 1892. Jack died in his beloved Mt. Gretna in March 2008.view less