In April 2011, our guide, teacher and friend Stephen Watson passed away. He had been ill for some months, and his illness and passing seems sudden to everyone who knew him. Stephen co-founded the Series and was intimately involved with the development of every book in it. And beyond the books you see here, he was a central part of our development as writers. Without him, our Series is unmoored. While we can never fill the hole that his passing leaves, the Series will grow in time in tribute to him. At BOOKSA, Ben Williams outlines Stephen's gigantic contribution, and gathers tributes from friends.—Arthur Attwell