On August 1, 1774, English chemist Joseph Priestley changed the world forever when he isolated oxygen gas. This breakthrough laid the foundation for modern chemistry and transformed our understanding of the natural world. But Priestley wasn’t only a chemist—he was also a philosopher, theologian, educator, and political thinker whose radical ideas inspired some of America’s Founding Fathers.

Despite his brilliance, Priestley’s unorthodox views made him a controversial figure in England. In 1794, he emigrated to the United States, where he continued his scientific work and became an influential voice in intellectual circles until his death.

In 1983, the U.S. Postal Service honored Joseph Priestley with a 20-cent commemorative stamp (Scott 2038). This stamp captures not only the likeness of a pioneering chemist but also celebrates his lasting contributions to science and free thought.

If you’re a fan of history, science, or vintage postage stamps, this collectible is a fascinating piece that connects you directly to one of the greatest scientific minds of the 18th century.