List of Famous people born on April 21st

Choh Hao Li was a Chinese-born American biochemist who discovered, in 1966, that human pituitary growth hormone (somatotropin) consists of a chain of 256 amino acids. In 1970 he succeeded in synthesizing this hormone, the largest protein molecule synthesized up to that time.

Peter Ludlow, 1st Earl Ludlow PC, known as The Lord Ludlow between 1755 and 1760, was a British politician. He served as Comptroller of the Household from 1782 to 1784.

Helen Prejean, C.S.J. is a Roman Catholic sister, a member of the Congregation of St. Joseph based in New Orleans, and a leading American advocate for the abolition of the death penalty.

Rao Ramesh is an Indian film character actor known for his works primarily in Telugu cinema, Telugu theatre, and television. He is the son of veteran actor Rao Gopal Rao. Rao Ramesh initially appeared in Okkadunnadu (2007), before getting a breakthrough role in Krish's Gamyam (2008), portraying a reformed Naxalite, he received critical acclaim for his portrayal and the film went on to become one of the highest grossing Telugu films of the year.