He is identified as the architect of many government buildings built during that period, including some listed on the National Register of Historic Places.

"[3] Early in his architectural career Oscar worked for the New York City firm of Carrere and Hastings.

[4] Soon after his resignation he joined Weary & Alford in Chicago as Supervising Architect, where he worked for five years.

[5][6] In the ensuing years his sight failed, leading to blindness and retirement in 1920.

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