He was born in Kragerø as a son of shipmaster Lorentz Andreassen and his wife Anne Marie Olsen.
He graduated from Hamar Teachers' College in 1889, and took the examen artium in 1892.
He was a member of the executive committee of Bergen city council from 1903 to 1919,[1] representing the Labour Party, and was the Mayor of Bergen in 1918 and 1919.
[3] In parliamentary elections Hopp was a losing candidate four times, in 1909, 1912, 1915 and 1918.
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