Born to an aristocratic Swedish family, he married his Danish cousin Karen Blixen (better known by her pen name Isak Dinesen) in 1913. The couple then moved to Kenya, where they bought a coffee plantation.
Bror's identical twin, Hans, died in a plane crash in 1917.
Bror's philandering was said to have led to his wife's contracting syphilis, although recent sources claim that Karen was the one who was infected, during her years in Paris.
Although the couple were divorced in 1925 (with Karen retaining the coffee plantation that had been financed by her parents), shortly before her death she was quoted as saying, "If I could wish anything back of my life, it would be to go on safari once again with Bror..."
For many years Blixen ran a firm of safari guides, and among his clients was Edward, Prince of Wales. "Hunting with Blix was a magnificent experience," said one client. "With his quiet, almost lyrical narrative of what happened around us he got nature to live like I have never experienced since (from The Man Whom Women Loved, a biography of Blixen written by his godson Ulf Aschan)." He was also a talented writer; his best-known book was his autobiography, African Hunter (1938).
Blixen left Africa in 1938 and returned to his native Sweden, where he died, in 1946, at the age of 59, following the crash of a car in which he was a passenger.
According to Beryl Markham, "Bror was the toughest, most durable white hunter ever to snicker at the fanfare of safari or to shoot a charging buffalo between the eyes while debating whether his sundown drink would be gin or whiskey . . . . The mold has been broken."