Endre Czeizel (3 April 1935 – 10 August 2015)[1] was a Hungarian physician, geneticist, public health administrator, and professor.

He was known for discovering that vitamin B9 or folic acid prevents or reduces the formation of more serious developmental disorders, such as neural tube defects like spina bifida.

In 1958, he married Judit Gerőfi, by whom he fathered two sons, Gábor and Balázs, and a daughter, Barbara.

[2] After 12 years of marriage Judit died; he later remarried to Erzsébet Mécs, whose daughter Andrea he raised.

[4] Czeizel's son-in law is Gábor Fodor, the leader of the Hungarian Liberal Party.