Johannes Jacob Wecker (1528–1586) was a Swiss physician and philosopher.
He worked as a doctor from 1566 and wrote a number of works about medicine, some of which were in both French and Latin. Doubtless fleeing accusations of sorcery, Wecker moved to Basel after having published Les Secrets de Wecker. For a number of years, he worked as a professor of logic at the local university.
He published Antidotarum generale, a work about alchemy. His work is known for the elaborate bibliography on chemistry-alchemy. He also reported the first known case of diphallia.[1]
Wecker married the poet and culinary writer Anna Weckerin. Two years after the death of her husband, she arranged for the publication in Basel of Wecker's Antidotarium Speciale, ex. opt. authorum … scriptis fideliter congestum et amplius triente actum.