Korsman laid the basis to the Finnish winter season shipping together with captain August Alexander Granroth.

Korsman founded also Vätti techno-chemical factory and engineering company Åbo Mekaniska Verkstads Ab.

His parents were vicar of Merikarvia Johan Jacob Korsman and Amalia Carolina née Achander.

[1] Korsman started his military career in Finnish Rifle Battalion in which he served as junior non-commissioned officer in 1846–1849, Fähnrich with Portepee in 1849–1851 and ensign in 1851–1852.

[1] A company called Finska Transito-ångbåtsaktiebolaget had started winter season operation between Hanko and Stockholm in 1876 by 298-tonne S/S Express.

[1] During the 1880s the number of passengers grew and in addition to mail delivery, Korsman exported Finnish butter and paper to the Swedish and British market.

Korsman and captain Granroth created the basis for the Finnish winter shipping, and Hanko became the centre of it.

In 1874 he took part at founding engineering company Åbo Mekaniska Verkstads Ab and became its manager.