[1][2] He was born in Bergen, Norway to physician Johan Randulf Bull (1815–94) and Theodora Josephine Marie Hambro (1818–49).

After her death in 1880, he married Ida Marie Sophie Paludan (1861–1957).

Bull was an accomplished university teacher and a very active clinical researcher.

He also wrote the travelogues Breve fra en ældre herre from 1900, Fra Alperne og Provence (1901), and Over lave og høie Fjelde from 1907.

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