Monica Johnson, better known by her stage name Doreen Shaffer (sometimes spelled Schaffer or Schaeffer), is a Jamaican ska, rocksteady, and reggae singer.

Johnson was born in Kingston, Jamaica in the early 1940s to a German father and Costa Rican mother.

[2][1] She started singing at school, initially inspired by jazz singers such as Dinah Washington and Sarah Vaughan.

[2] She began her career at Studio One, recording duets with Jackie Opel, before they both joined the Skatalites in 1964.

[2] A collection of her recordings for producer Bunny Lee, First Lady of Reggae, was released in 1970.