| Born | 1835 |
| Died | 1893 (Kjos Haveby) |
| Nationality | Norway |
| Genre | portrait |
| Profession | painter, portrait painter |
| Family | Sibling: Einar Isaachsen |
| Teacher | Adolph Tidemand, Thomas Couture |
| Notable works | Old man (1858), Porträt des Amaldus Nielsen (1863), Cleopatra (1860), Wounded Man. Study for Fight in an old Farm House (1866), From Sprangereid (1877) |
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| Born | 1835 |
| Died | 1893 (Kjos Haveby) |
| Nationality | Norway |
| Genre | portrait |
| Profession | painter, portrait painter |
| Family | Sibling: Einar Isaachsen |
| Teacher | Adolph Tidemand, Thomas Couture |
| Notable works | Old man (1858), Porträt des Amaldus Nielsen (1863), Cleopatra (1860), Wounded Man. Study for Fight in an old Farm House (1866), From Sprangereid (1877) |