His firm was based in Winston-Salem, North Carolina.
Northup began his architectural practice in 1906 and partnered with Leet Alexander O'Brien (1891–1963) in 1915 or 1916.
It included partners Willard Close Northrup and Leet Alexander O'Brien and Luther Lashmit.
[2] Either alone or with O'Brien, Northup designed many of the prominent buildings of the period in Winston-Salem and elsewhere in North Carolina, along with over one hundred schools in the state.
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