"They say it's your birthday" - writers born on April 21

Charlotte Bronte  (1816) 

Robert Brustein  (1927)
Alistair MacLean  (1922) 
Thomas A. McMahon  (1943)
Gladys Mitchell  (1901)
John Mortimer  (1923) 

John Muir  (1838)
Kole Omotosho  (1943)
Barbara Park  (1947)