Jacob (or Jaap) Gestman Geradts (born 9 December 1951, The Hague) is a Dutch pin up artist painter.
Geradts studied electronics at the Delft Technical University where he received his master's degree in 1977.
First influenced by Alphonse Mucha, he soon modified his style in the way of the great pin up artists of the 1950s and 1960s, like Alberto Vargas, Aslan and George Petty.
Unlike many other artists, Geradts uses color pencil instead of airbrush and instead of canvas or paper he uses sheets of satinised polypropylene.
From the early 1990s on Geradts started composing and performing post-pop music, released by the name of Raticide.