He was the son of John Grieg (1819-1887) and Jutta Camilla Lous (1825-1901).
In 1884, he founded a ship brokerage company during the period of transition from sail to steam.
[2] [3] Grieg held a number of public and civic offices.
In 1919 he bought Troldhaugen, the home of his cousin, Edvard Grieg.
[4] He was elected to the Parliament of Norway from 1906 to 1909, representing the Liberal Left Party.