He studied the plants of the Budapest region, and served as a curator of natural history at the Hungarian National Museum.

As a professor of botany at the medical school in the University of Pest, he influenced numerous Hungarian naturalists.

After completing high school studies, Sadler became a pharmacist's assistant at the pharmacy of the Order of Mercy.

[1] His students included the botanist Josif Pančić[2] and the physician Ignaz Semmelweis.

[6][7] The plant species Potentilla sadleri and Ferula sadleriana and the genus Sadleria were named after him.