Claus R. Greiner was born to Albert and Gertrud Greiner on September 8, 1936, in Stuttgart Germany. He grew up with his younger sister, Eleonore. The family moved to Spaichingen, Germany, and that's when he also discovered his love for music and playing piano and organ and he often played for Sunday church. Spaichingen is also where he met his future wife, Helga. Claus and Helga met during middle school and would meet every morning to walk to school together. They married on May 19, 1961, and had their only daughter, Ursula a few years later. Claus continued to follow in his father's footsteps and worked at 'Firma Greiner,' while continuing college in the evenings to obtain his master's in engineering. Claus and Helga lived to travel; Claus did move his family to Canada in the late 60's, but eventually returned to Germany. Their dream of moving abroad didn't die, and after 'Firma Greiner' closed their doors in the 80's, Claus accepted a job through Hilti, Lichtenstein, which would move his family to Jackson, MS, and a few years later to their final home in Broken Arrow, Oklahoma. Claus managed the production in the plant, traveled a lot for Hilti throughout his career, and stayed at Hilti until his retirement. Throughout their life, and even more so after retirement, Claus and Helga spent every free moment either seeing the world, or planning their next trip, and if they couldn't do either, they were at the lake and on their boat. Claus was also very involved with Tulsa's German American Society; he was President of GAST for many years; as well as on the board of Octoberfest. Claus and Helga were completing the World Cruise-in sections- when he unexpectedly lost his wife in 2016. Claus was battling health issues as well and went to live with his daughter and grandchildren after the loss of his wife. Claus remained with his family and on Hospice care until succumbing to his illnesses on July 15, 2022. He never lost his love for his wife, family, music, or travel.