Historical Figures Born in 1858

Physicist · 1858 – 1947

Max Planck was a German physicist who originated quantum theory by introducing the quantum of action, a discovery that launched modern physics and earned him the 1918 Nobel Prize.

• Quantum theory
• Planck's constant

Statesman · 1858 – 1919

Theodore Roosevelt was the 26th President of the United States, a soldier, conservationist and reformer — and a remarkably prolific author who wrote around forty books on history, nature, politics and exploration alongside his public career.

• 26th U.S. President
• National parks and conservation