He was a disciple of the famous Italian physician Girolamo Mercuriale and he also worked on human anatomical nomenclature.

[2] He was later made city physician (Stadtarzt), professor of the practice of medicine, rector of the university, and dean of his faculty.

[4] The Pinax theatri botanici (English, Illustrated exposition of plants) is a landmark of botanical history, describing some 6,000 species and classifying them.

[citation needed] In addition to Pinax Theatri Botanici, Gaspard planned another work, a Theatrum Botanicum, meant to be comprised in twelve parts folio, of which he finished three; only one, however, was published (1658), long after his death.

He also gave a copious catalogue of the plants growing in the environs of Basel, its flora, and edited the works of Pietro Andrea Mattioli (1500–1577) with considerable additions.