To my mind the heros of pop-up books are the paper engineers who turn 'ordinary' illustrations into amazing 3D objects. Some appear to be bigger than the book that they leap out of, like the final page of "Ben's Box" engineered by David Carter and David Pelham. Some make a noise - what is it that is sawing it's way out of the crate in "Haunted House" by Jan Pienkowski.
Robert Sabuda has to be the most accomplished and sophisticated paper engineer in the world. I don't know anyone else who would even attempt the entire snow covered village from "The Night before Christmas"
Ron van der Meer is the designer of the'Pack' series of books. Including the Maths Pack, Architecture Pack and the Brain Pack he really does put pop-ups way beyond being only children's entertainment.
David A Carter is best known for his 'Bug' books like "How Many Bugs in a Box" and "Bugs that go Bump in the Night"
Keith Moseley is a British Pop-up artist based in Yorkshire. Check out his web-site for pop-up houses, flowers, and a wide range of other subjects.
Nick Bantock produces some of the strangest pop-up books. "Solomon Grundy" contains some of the oddest characters you could ever wish not to meet!
David Hawcock is another UK pop-up engineer based in Bath. His web-site sometimes has his books for sale at bargain prices.
Jonathan Emmett lives in Scribble Street it seems.He really comes from Nottingham and his bright, colourful website is aimed at the children's market. Interesting though.
John Patience is a British author and illustrator who has also produced pop-up books, some in tandem with Keith Moseley. His web-site includes a section for GCSE students looking for help with paper engineering.