Mette Marie Wang was born on 31 January 1876 in Christiania (now Oslo) to merchant Hans Emanuel Wang (1839–1918) and Anne Kathrine Tandberg (1839–1898).

[1][2] She made her acting debut in February 1899 as Susanne in a production of Thérèse Raquin at the Eldorado Theatre in Oslo.

[3] From 1899, with a few interruptions, Bull was employed at the National Theatre and in 1916, participated in its guest play in Stockholm.

Among her leading roles were Pernille in The Fidget and Elina in Ved Rigets Port.

[4][5] On 18 December 1897, she married opera singer Jens Elias Berntsen, but the marriage was later dissolved.