He hailed from Silesia, and migrated to Denmark in the early 17th century.
In 1619 he was given the right to open a pharmacy in Bergen in the Province of Norway, but he probably did not take the offer.
He continued his career in Copenhagen, and served as pharmacist for the Danish Royal Court from 1633 to 1639.
Another son Esaias Fleischer became a notable clergyman.
Esaias Fleischer was married twice, last to Maren Hansdatter, a sister of Hans Nansen's wife.