|The front cover image is from Caricature by Daniel Clowes|
Paul Gravett is, along with Peter Stanbury and Megan Donnolley, part of "team Comica". Each year in November they organize a series of events in London featuring local and international comic and graphic novel creators (in 2012 they had Aline and Robert Crumb). Plus there is their wonderful Comiket - a great opportunity to buy books and meet the creators of comics and graphic novels. Paul Gravett and Peter Stanbury are also co-founders of Escape Books.
Paul Gravett is well placed to give an overview of graphic novels. He has written a number of books on this subject but Graphic Novels everything you need to know is probably a good place to start if you are new to this world. It is full of sample pages from a wide variety of creators along with Paul's informative descriptions and notes. It is a lovely book to leaf through and should give plenty of ideas about further reading.
You may like to visit Paul's blog, the Comica Festival website and to see the full list of Paul's books on this subject.