Taikichiro Mori Was The Richest Person In The World In The Early 1990s – Who Was He? How Did He Build His ? | Celebrity Net Worth 2026

Bill Gates has been the richest man in the world for 18 of the last 33 years. However, back in 1991 and 1992, Taikichiro Mori, a mild-mannered economics professor turned billionaire real estate developer was the richest man in the world. He became the richest with a fortune of $16 billion in 1992 (equivalent to $84.4 billion today), by leaving academics behind at 55 and building a real estate empire in downtown Tokyo. Mori was known as Tokyo's "ooya-san," a friendly term for landlord. Each of his buildings carried his name and the building's chronological place in his empire – Mori Building One, Mori Building Two, etc. Over the years, his Mori Building Company built and ran about 80 buildings in downtown Tokyo near the Imperial Palace and Government agencies.

Mori was born on March 1, 1904, in Tokyo. His father was a rice farmer and merchant who over the years, acquired two buildings. He graduated from Tokyo Shoka University (now called Hitotsubashi University) in 1928. In 1932, he became a professor at the Kyoto Institute of Technology. In 1946, he went to work at Yokohama City University. In 1954, he became the Dean of the Faculty of Commerce. He retired in 1959, at 55, to run the Mori Building Company after his father died. The timing could not have been better as Japan was poised to begin a frantic pace of expansion. Mori initially focused on the Toranomon neighborhood where he grew up. The neighborhood is a residential area of small wooden buildings and narrow, winding streets that had been destroyed by an earthquake in 1923 and then again by bombing by the Americans in World War II. He transformed that neighborhood into a modern, urban center full of sleek glass, concrete, and brick skyscrapers.