Regnier de Graaf
Regnier de Graaf was born on July 30, 1641. See ranking, bio blurb, and everyone else born that day.
About Regnier de Graaf
Regnier de Graaf (English spelling), original Dutch spelling Reinier de Graaf, or Latinized Reijnerus de Graeff (30 July 1641 – 17 August 1673), was a Dutch physician, physiologist and anatomist who made key discoveries in reproductive biology. He specialized in iatrochemistry and iatrogenesis, and was the first to develop a syringe to inject dye into human reproductive organs so that he could understand their structure and function.