After graduating he entered the office of Hodgson & Son, architects,
Minneapolis, and remained with this firm in their Minneapolis and
Omaha offices until 1889, when he made a trip to Europe for professional study. About ten months were spent abroad, during which he visited
England,
Scotland,
France,
Italy,
Switzerland,
Germany,
Denmark,
Sweden and
Norway. Returning in 1890, he secured a position with Wilson Bros. & Co.,
Philadelphia, who were then making plans for the new
Pennsylvania School for the Deaf at
Mt. Airy, and for nearly a year he was engaged on the plans for these extensive buildings. In 1891, he returned to Minnesota and worked at his profession in
Duluth and Minneapolis. For about two years he taught in the school for the deaf at Faribault. But, being resolved to follow his chosen profession of architecture, he opened an office in
Faribault, where he was engaged in business on his own account for about three years. Among the buildings erected from his plans are: The
North Dakota School for the Deaf; a boys' dormitory building at the Kendall school,
Washington, D. C.; one building for the State School for Feeble-minded at Faribault; residences for Dr. J. L. Noyes, Faribault, for Mr. J. C. Howard, Duluth, and half a dozen others in Faribault and elsewhere; also six brick stores and business blocks in Faribault and other places; and a hotel for the Orinoco company in
Venezuela. He engaged on a public school building for the city of Faribault, which was won in competition with about twenty architects. Hanson also designed
Charles Thompson Memorial Hall in
Saint Paul, Minnesota. The hall has wide hallways which allows
signers to see each other and communicate more clearly, Hanson's papers were donated to the University Archives of Gallaudet University. Some of his papers are also located at the Rice County Historical Society,
Faribault, Minnesota. There is also some other archival information on Hanson at the Northwest Architectural Archives,
University of Minnesota. The
University of Washington, Department of Special Collections, has material on Hanson related to his work in the UW Department of Buildings and Grounds. Hanson served as President of the
National Association of the Deaf of the United States (NAD) from 1910 to 1913. ==Personal life==