Dav pilkey and mathew reilly have two very different ways of writing. Dav Pilkey uses pictures to enchance his writing and is aiming at kids. Matthew Reilly does kind of serious books and is aiming at adults. Suzanne collins has two series and lives in new york. She has two feral cats that she adopted and started to write when she thought of Alice in wonderland and thought that you are more likely to fall down a manhole than a rabbithole, and started to write: gregor the overlander.