In the late 1860s, he and his brother Maximilian created America’s first commercially produced yeast, which revolutionized baking in a way that made today's mass production and consumption of bread possible.

The brothers, along with another business partner named James Gaff, founded what became the Fleischmann Yeast Company in Riverside, Cincinnati, in 1868.

When prohibition interfered with liquor sales, the Fleischmanns developed a new market for yeast, investigating its possible health benefits for skin and digestion, and promoting it as a good source of vitamins.

The bon vivant, sailor, and sportsman was the youngest mayor by the year 1900 and later served three times as a delegate to the Republican National Convention.

[9] Fleischmann's great-great-great-granddaughter Elizabeth Holmes is an American fraudster and former businesswoman who founded Theranos, a failed and fraudulent blood-testing Silicon Valley startup.