He lived in Vienna, WV until 1951, moved to Marion, Ohio until 1957, attending Harding High School in Marion, Ohio moving to Utica, NY for his senior year of high school, graduating from Utica Free Academy public school in 1958. Greiner served four years in the USMC, honorably discharged in 1961. He attended Utica College and Wayne State University, married in 1964 to Nancy McClellan and raised three children. He started a restaurant and developed a consulting service as an advisor to investors. Retired at age 60, he pursued writing; prior to writing years, he was a dedicated reader.