Came to Canada in 1874.
Family living at 98 Carling, Ottawa in 1911 and 147 Patterson Ave in 1923.

First Jewish Alderman of Ottawa.

Although married in he USA, residence was Ottawa, Ontario, Canada.

A Biographical Dictionary of Canadian Jewry, 1909-1914 from The Canadian Jewish Times
PART I - Topical Entries
Engagements and Marriages
ROSENTHAL, Alderman Samuel, of Ottawa, and Miss Augusta Posnanzki, daughter of the late Samuel Posnanzki, former mayor of Chippewa Falls, Wisconsin, were married by Rev. Samuel Hirschberg, of Temple Emanu-El, at the Pfister Hotel, Milwaukee, on Mon. June 21, 1909, at noon. The bride's wreath was worn by the bridegroom's mother at her wedding forty-one years ago. The bride was given away by her brother, Maurice Posnanzki. Miss Pearl Evelyn Levy was the maid of honor and Arthur Rosenthal was the best man. Guests included: Mrs. A.S. Rosenthal and Mr. and Mrs. A. Rosenthal, of Ottawa; Julius Lesser, of Chicago; Mr. and Mrs. F. Kreider, of New York; Mrs. H.L. Levy and Miss Pearl Levy, of Eau Claire; Mr. and Mrs. J. Edward Posnanzki and Maurice A. Posnanzki, of Chippewa Falls; Rabbi and Mrs. Samuel Hirschberg, Mr. and Mrs. Emanuel Phillips, Mr. and Mrs. I.P. Kahn, Mr. and Mrs. Harry Glicksman, Mr. and Mrs. Nathan Glicksman, Mrs. F. Docter, Mrs. R. Silber, J. Docter, Miss Ray Muller, Miss Belle Heller, S.L. Stein, Miss M. Stein, Miss Dorothy Phillips, all of Milwaukee. The couple will reside in Ottawa
(The Canadian Jewish Times, vol. 12, no. 29 [2 July 1909])

Came to Canada in 1890, but travelled back and forth between Canada and USA.
1905 Wisconsin census reports parents born in Poland(Russia) and Germany.