IF THIS IS THE JOHN GEORGE GNEHM FROM RIVERSIDE, THEN HE IS THE BROTHER OF HENRY EUGENE, MY GREAT GRAND FATHER. I FOUND INFO ON HIS IMMIGRATION FROM ZURICH SWITZERLAND AT ellisisland.com . EUGENE CAME OVER ON THE SS SAINT LOUIS. YOU MIGHT TRY UNDER JOHAN INSTEAD OF JOHN. SEVERAL OTHER BROTHERS AND ONE SISTER ALSO CAME. BUT, IT MAY HAVE BEEN AT DIFFERENT TIMES. GOOD LUCK