What I know about my Grandfather Theophil Keller (Keller-4565), born in Glattfelden, Zuerich, Switzerland in 1866, died 1945 and was married to my Grandmother Rosa Lee (her maiden name) (Lee-19736), born in Glattfelden, Zuerich, Switzerland in 1879. Died in 1944. To be noted is that my Grandfather never emmigrated. He after his studies kept teaching his entire life in Zuerich, Switzerland. If it helps, please check out: https://www.myheritage.de/site-family-tree-239982261/keller