Johanna Unna was born in Rendsburg, Schleswig-Holstein, Germany, on May 25, 1844. In her early years, she was educated in Europe. She immigrated with her family to the United States in 1856 and eventually settled in Chicago, where she continued her basic education. She married Moritz Loeb, who emigrated from Bechtheim, Germany, and who died on April 10, 1892, at age fifty-two. They had four sons, Jacob M, Albert H., Julius, and Sidney. All of them were prominent in business and continued the family legacy of civic and communal service. Jacob was president of the Chicago Hebrew Institute, the predecessor of the Jewish Community Centers of Chicago, from 1912 to 1932, and was a board member and president for the Chicago Board of Education. Albert was the general manager of Sears, Roebuck and Company. Julius became vice president of George Kraft Company. Sidney was a successful real estate broker.