He finished his secondary education in 1892, and graduated with the candidate.jur.
Rolf left in 1930. In 1931 the company Sundt & Sundt was dissolved and he continued on his own. He was also a legal consultant for LKAB from 1904 to 1915. He was a Southern Norway patriot, a national romantic strongly rooted in the 1890s Liberal oppositional tradition, and a "European liberal".
He published extensively in their journal Norsk slektshistorisk tidsskrift as well as in the newspaper Dagbladet.
Other works include the biographical sketch of Povel Juel in Norsk biografisk leksikon as well as an unfinished monography about the same person. He was a supervisory council member from 1928 to 1930 and deputy board member from 1930 to 1932 in Vinmonopolet.
He died in August 1948 at Rikshospitalet.
He was a member of Oslo city council from 1917 to 1919 and again from 1932 to 1937, and stood for parliamentary election for the party in 1924 and 1933 (first ballot candidate) without being elected. He was a board member of Venstres Hus, the party-affiliated newspaper Dagbladet, and the theatre Det Norske Teatret from 1925 to 1947 (chairman since 1935). In the business world, he was a board member of Bratsberg Bruk, Saudefaldene, Flørli Kraftog Elektrosmelteverk and Laatefos.
Mostly hydroelectric power companies.